We charge £10 per fall but cap it at a maximum 3 falls. We have an award dinner paid for with the proceeds at which we have Oscar style prizes - 'muddiest fall', 'most premature exit', 'best double act' that sort of thing. Then there is a trophy for 'Faller of the Year' which is awarded with a tube of super-glue. The money raised pretty much covers the food and drink but we do raise money for the Air Ambulance at other events.
Ours is £10 for a fall and £20 if you fall off and let go of the horse. Money collected goes to the Air Ambulance and there is a trophy awarded at the end of the season to the greatest contributor (its in my living room thanks to my OH's supreme efforts to raise money for a good cause...)
I got bucked off on the way TO the meet and I tried to get that disallowed but it wasn't. As if the embarrassment of the horse turning up at the meet on its own with me in hot pursuit wasn't enough I had to pay too......
Nearly as embarrassing as being the first person to fall off at the first fence at last season's opening meet. And that was off Max - thankfully he redeemed himself many times after that.