I'll call my fishing partner later today and get you some more info on O.B.B. Unfortunately, they didn't have any non-boaters when I was in the club and I doubt that they do now. Outside of big-time FLW type tourneys, I don't know of any small clubs that use a non-boater. By the way, you don't actually need a fancy $20,000 bass boat to fish these types of tournaments. There are guys in O.B.B. and in my club who fish with john boats equipped with small 30+ horsepower engines and they still place in the money in some tournaments.
The club I'm in now doesn't actually have a set number of boats. It's just that most of the people in the club (including myself) don't want to see it expand any further. 20 boats is big enough to have a decent payout, but small enough that everyone knows each other (which keeps it honest) and everyone has a decent chance of winning (instead of just a few ringers). In O.B.B. it seemed like it was the same top 5 or so boats that won most of the tourneys.
Plus, in our small club, we hold catered Bar-B-Q dinners sometimes and we also pay for everyone's hotel rooms when we go down to Lake Okeechobee. Stuff like that. It makes it nice. I'll ask around to see if there are any local non-boater events, but honestly I doubt I'll find out very much.