Yes some of the money goes towards the club, and the up keep of the local courses. But you also win money if you play Open, and KC Cash, which you can use to buy discs if you play advanced or intermediate.
There is also a Beginners league on Monday's that is free, and you do not have to be a member of the club, but it is encourage.
Leagues also keep records, and provide you with an average of your rounds, I like this to keep my progress. Plus it's just a lot of fun!