"Paying for a course with Likes" (they could be deducted from the Leaderboard - perpetum mobile style) or by achieving certain Community Leaderboard Level or by paying for course with fCoins (these features available in Pro only) would be awesome feature especially for those who doesnt want to integrate fCommunity with other plugins, CRMs etc - just keep it simple: outside the box. It would allow to have an exclusive access for fCommunity active users to some courses (incentive bonus implemented into the fCommunity plugin)