The Same Growth Math Runs at €20 a Day and $2M a Month

In 2018 I was running Google Ads for a self-storage operator in Ireland on about €20 to €25 a day. A few years later I was part of rebuilding paid acquisition at The RealReal, a public company, where spend went from $300K to more than $2M a month at 7x ROAS.

Most people would call those two different jobs that need two different people. The budgets are more than two thousand times apart. The math that decided where each euro and each dollar went was the same.

That is the belief I want to argue with: that a company needs a growth leader who has done its industry, at its size. Industry knowledge helps. It gives you the vocabulary and tells you which trade shows matter. It does not tell you which channels can pay back. That comes from how your buyer decides, and businesses that look nothing alike decide in a small number of ways.

Read the pattern from the buyer, not the company

Three questions place a business. None of them is how big you are or what industry you are in.

What does a customer pay you in a year? Annual contract value, or first-year revenue per customer for a consumer business, sets which channels can work at all. The bands I use:

• Under $500 a year: SEO, top-of-funnel paid social, partnerships, referral loops.
• $500 to $5K: paid search, mid-funnel paid social, content, communities.
• $5K to $50K: LinkedIn, outbound, content, intent data.
• Above $50K: outbound, account-based work, events, partnerships.

How does the buyer buy? A self-serve checkout or trial lives on intent channels: search, comparison sites, communities. A sales-led purchase needs channels that warm the buyer up before a conversation, like LinkedIn, content and events.

Where is the buyer when the need hits? A finance director who needs to automate payables starts on Google. A creative agency owner is on LinkedIn and YouTube. Cut the channel list by half on this question before a dollar is spent.

The price band is where I see the most money lost. If you sell a $1,200-a-year product and buy LinkedIn clicks at $40, the unit economics will not work, and no amount of optimization fixes that. The channel is wrong for the price.

Then every channel gets the same equation

Once you know the pattern, each candidate channel runs through the same arithmetic, whether the budget is €20 a day or $2M a month.

Cost per customer = cost per click ÷ visit-to-customer rate. For a sales-led business, divide again by lead-to-close.

The most you can pay = one third of the gross profit a customer produces in their first 12 months.

I worked this through in a 2017 note on channels for an indoor air-quality monitor. At a 1% onsite conversion rate and a $1.20 cost per click, a customer costs $120 in clicks. The question I asked was whether there was room for real growth there at all, before asking whether better tactics could shave the cost. For that product there was search volume, so the answer was yes. For a new product in a category nobody searches for yet, I would pass on paid search and put the money into the channels that create the demand. And I wrote the threshold down before testing: if the tests showed a real audience and brought the click cost to $0.60, paid search moved forward.

That last step is the habit worth copying. Decide the number that turns a channel on before you spend, so the result makes the call and the mood in the room does not.

Four gates before a channel gets real budget

A channel earns a primary place in the plan when it clears all four:

• Cost to acquire at or below 33% of the 12-month gross profit per customer.
• Payback inside 12 months for B2B, inside 3 months for consumer.
• Enough volume to carry 25% or more of a quarter's target.
• Results that repeat for at least 8 weeks.

Fail any one and it is a tactic. Keep it running if it helps, but do not plan the quarter on it.

None of the gates moves with company size. When I worked with FactoryFix, a platform staffing manufacturing plants, the plan I wrote budgeted $800 to $1,100 a month in advertising at a cost per lead of around $20 or less, with lead capture for a sales follow-up rather than a signup, and voicemail drops on the list because its buyers were old-school manufacturing operators who still listened to them. The channel list followed from the buyer rather than from what was fashionable in startup marketing that year. FactoryFix grew its platform 200%.

At The RealReal the inputs had more zeros and the questions did not change: what a customer costs, what they are worth, how fast the money comes back. Spend went from $300K to more than $2M a month at 7x, with $100M+ a year in attributed revenue and acquisition cost down 40%. Bigger inputs. Same rules.

If you want a second read on which pattern your business is actually in before next year's budget gets set, that is a good use of a 20-minute conversation.

The pattern moves, so read it again

A pattern is not permanent. Moving upmarket changes your price band. Adding a sales team changes your motion. And the channels change underneath you. In a 2020 note to a founder I described Facebook ads as good in 2016, okay in 2017 and very crowded by 2020. The equation never changed. The cost per click did, and that changed which businesses the channel could carry.

So the pattern gets re-read at three moments: when pricing changes, when the sales motion changes, and once a year regardless. A lot of stalled growth is a company still running the channel mix of the pattern it used to be.

At your next growth review

You do not need to open an ad account to run this. Ask for one page with a row per channel and five columns: cost per customer from the equation, the ceiling at one third of 12-month gross profit, payback in months, weeks of repeatable results, and the share of the quarter's target it could carry.

Any row with a blank column is a tactic being reported as a channel. Then ask which price band the company sits in and whether the biggest line in the budget belongs to that band. A $1,200 product with LinkedIn as its largest line is the conversation to have first.

What to do tomorrow

Take your two largest channels. Write down the cost per click, the conversion to customer, the cost per customer that produces, and one third of your 12-month gross profit per customer. If either channel sits above that ceiling, that is where the budget conversation starts. If both sit below it, check them against eight weeks of results before you scale either one.

The size of the budget tells you how much is at stake. It does not tell you which rules apply. The person to hire, and the habit to build, is the one that reads the pattern first.