I don't like the CTP on the last night idea. It REALLY sucks for the guy who bought in most of the season and can't make it that one night, and is great for the guy who hardly made it out at all but happens to be free on the last night.
We do 50% goes to the club to be spent on course maintenance, 50% goes to next year's ace pot to start it up good.
If you run an ace pot in the future, I really think that you need to decide what to do in this situation before you collect any money. If everyone knows the rules before they pay in, they shouldn't have any hard feelings about what you do with the left over money (and if they do, you can tell them to screw off guilt free). As long as everyone knows what they are getting into, I don't think it really matters what you are going to do with the money.