GROWING A PASSION PROJECT TO $300K ARR WITH A $0 CAC

Summary from the TLDR Marketing newsletter

More than 50 percent of Old Girls Club members chose to pay a $10 monthly fee when pricing was introduced to what began as a free Slack community. The high conversion rate reflected a high-trust, high-engagement environment where members saw tangible value in peer connection and participation. Instead of using growth hacks or email campaigns, the founder created momentum by spotlighting power users, giving members product influence, and creating rituals that encouraged people to invite others.