Anyone creating events that require collection of money via Paypal, please uncheck the "add fees" box when creating the ticket and instead manually calculate the price with this formula - use a calculator, Excel, or pen and paper:
Price = (Amount Due + 0.3)/0.978
Use the resulting Price as the ticket price (leaving the "add fees" box unchecked).
For small amounts (like $20) it doesn't make much difference (pennies), but it adds up quickly when in the hundreds of $. The default "add fees" option overcollects because Groupspaces does not know how to deal with our lower non-profit fee rate structure.