Case study · Cob Editions · 2013-2021

Seventy-seven months of monthly P&L, line by line

Cob Editions · unit economics and margin management · performance marketing · 2013-2021

Illustration: a long frieze of monthly bars, two below the line at the start, the margin line in orange rising steadily

Plenty of marketing directors can read a budget. Few have held a monthly profit and loss account on their own business, for more than six years, with cost of acquisition, conversion rate, unit value and margin on the same sheet.

That is what this file covers: 77 months of actuals, from May 2013 to September 2019; the same sheet then projects to December 2021, and those months are not counted here. In 2018 alone the machine handles over 600,000 leads and produces over 8,500 sales, at a gross margin of 28.1%.

And two facts I prefer to all the others. The take rate does not move for six years, staying between 1.39 and 1.51%. What improves is value per customer, which more than doubles over the period. And the first two years are loss-making, owned and budgeted, for a modest cumulative amount. A curve that only ever goes up does not exist.

01 · Context

Cob Editions was my own performance marketing company. No agency fees, no rate card: revenue came from performance, meaning the gap between what a lead cost and what it returned once converted. In that model there is nowhere to hide. A negative month is negative, and you have to know why before the end of the following week.

The constraint

A business living off the gap between a buying cost and a resale price is structurally fragile. Lead cost rises when competitors bid, revenue falls when the advertiser renegotiates, and both can move in the same month. Add that an audience has a short life, that every ad fatigues within days, and that a profitable segment stops being profitable without warning. Managing that quarterly is impossible. It has to be managed monthly, with margin in front of you.

03 · The system

1 · Keep the sheet by the month, not by the quarter.

Cost per lead, conversion rate, unit value of the client, gross margin. Four columns, one line per month, over more than six years. It is the document that lets you open or close a segment on a ten-minute decision.

2 · Look at unit value, not volume.

The billing rate stays flat for six years, between 1.39 and 1.51%. Volume grows too, but profitability comes from elsewhere: from the value per client, which more than doubles. In other words, it comes from negotiating the payout and the client's lifetime, not from a better conversion rate.

3 · Own the building years.

The first two financial years are loss-making, for a modest total. They are in the sheet, in their place, with the tipping point identified. A P&L that only shows the good years is not a P&L, it is a brochure.

4 · Decide on a return target, not on a hunch.

Segment openings and closures are decided on a return-on-investment threshold written in advance. Which means agreeing to close a segment you like, and doing it without argument, because the threshold was set beforehand.

5 · Separate what the machine proves from what it does not.

Over the whole period, the only returns on investment actually measured are one positive and one clearly negative. There is no publishable overall return figure, and I do not publish one. What is publishable is the gross margin achieved and the stability of the billing rate.

04 · Results

Monthly P&L, May 2013 to September 2019.

77 months of monthly P&L, with cost of acquisition, conversion rate, unit value and margin on the same sheet
Over 600,000 leads and over 8,500 sales in 2018 alone
28.1% gross margin in 2018
Take rate stable between 1.39 and 1.51% for six years
Unit customer value more than doubled over the period, while the conversion rate stayed flat
Two loss-making building years, owned, with the turning point identified in the sheet

05 · What it proves

A marketing director who has held a monthly P&L on their own business does not talk about budget the same way. They know what a decision costs, they know when a segment stops paying, and they know how to say no to volume that returns nothing. That is the discipline I install in companies today, at a different scale. The scale changes; the sheet does not.