Agreed... regatta fees are a relatively small part of the expenses. HOWEVER you have to hook the potential participants. Dont give them an excuse. There is a littany of crazy stuff your buddies will come up with for excuses. (the dog, the wife, the children, the parents, the car broke down, cant miss Glee....)
Example: Western Challenge regatta. Cost FREE. How many toledoans piled into a Van? 6. we divided the cost of diesel 6 ways and shared rooms. on a 14 hour trip that wasnt too bad. Even splurged for an evening at the Ballet.
Month later: Western Regional Regatta. Cost $30. How many toledoans? Just me. I drove up to Detroit and split van and hotel with 3 others. same 14 hour trip. More money.
Whats this have to do with the entry fee? Maybe not much. But here is my point:
Ask someone to do a regatta for $0-$60. They jump in with both feet, whip out the credit card and enjoy the weekend or week with their buds.
Ask the same guy to do a regatta with you for $120 and he automatically starts crunching figures into his head... fuel, hotel, paternity suits... etc. Whats his answer? Get my drift?
The final cost has little to do with it. Its all about suckering.... er convincing them that this is the best thing they can do with their time and money.