I headed the Pittsburgh Area Group buy 2. Our primary payment method was paypal. As most of us know you can receive payment as a gift and not be charged. Most payed me by doing so and Paypal flagged and shut down my personal payment options. I complained and got that opened back up but they said that I can't use that option for doing the grain buy. Check out pg 37 of the pitt group buy 2 for the email I received.
With that said I have been searching for a money transfer service and I found one that I believe we can all use and not be raped by fees. DWOLLA
Dwolla is free to sign up and like paypal in that you link your bank account to add funds and send money to people. Instead of the 3+% and $0.40 transaction fee Paypal steals from us Dwolla only charges $0.25 per transaction over $10.00. Thats it!!
This should make it simple for the organizer to collect money in full. All member just add $0.25 to you grain purchase and your good.
Well hope this helps.