04/ the maths
The three numbers every campaign answers to.
Ongoing plans start from £1,500 per month; the campaign budget beyond that is set by the goal and the maths. A common rule of thumb puts allowable member acquisition cost at 50–100% of first-year dues (MembershipCorp), and a healthy campaign aims for a lifetime-value-to-cost ratio of at least 3:1 (GlueUp).
Retention is 5–25× cheaper than acquisition (Harvard Business Review), so fund renewal too.
Timing sets a ceiling on recruitment. The Ehrenberg-Bass Institute estimates only about 20% of business buyers are in the market over a year and around 5% in a quarter (a heuristic for B2B purchases, not membership data), so a single burst can’t reach buyers who aren’t ready. Spread spend across the year.