The CAC Reduction Playbook

7 findings

1. 01

   Expansion costs half of new

   One dollar of sales and marketing buys a dollar of expansion ARR against two dollars for a new customer. Expansion already supplies 40 percent of new ARR at the median, and 67 percent above $100M.

2. 02

   Your price tag sets your payback

   Eleven months under $5K contract value against twenty two months at $50K to $100K. The $10K to $50K band is the most expensive segment in SaaS: too complex to self-serve, too small to justify field sales.

3. 03

   Attribution error beats the effect

   Across 663 randomised experiments inside Facebook, non-experimental attribution was wrong by 62 to 115 percent against true lifts of 6 to 28 percent. eBay measured one campaign at +1,632 percent observationally and -63 percent experimentally.

4. 04

   You arrive at month 7.6 of 11.3

   Eighty three percent of buyers start that first contact and 81 percent already have a preferred vendor when they do. Contacting earlier than the 70 percent mark measurably reduces win rates.

5. 05

   Two thirds of searches never click

   Zero-click reached 68 percent of United States Google searches. Readers click a result on 8 percent of visits when an AI summary is present, against 15 percent without one, and being cited roughly doubles what click-through remains.

6. 06

   The gap is between companies

   Payback runs from under six months to over twenty four, a spread wider than the gap between channels. In one advisory dataset the same channel returned 19x in the top quartile and 1.7x in the bottom.

7. 07

   Efficiency rose, retention fell

   Blended CAC ratio fell 28 percent in a year while gross retention slid from 90 percent toward 84. Both are true at once, which is why the two workstreams have to run together: refilling a leaking bucket faster is not efficiency.