Yes. Fundable forces users to sign up for a paypal account or pay by check. It does raise the transaction activation energy but i think this is the best way to circumvent the double-fees problem.
are you doing something similar to fundable.org? What not try the simple method?
Let all the payers transfer the money directly to that one person. Then, you send an invoice to that one person for your commission and trust him to actually honor the invoice.
This is what Ebay does and it seems to be working well enough.
We (2 guys at the moment) are currently looking for 1 or 2 more cofounders for our finance-related startup project. We are currently in the midst of building the demo, hopefully in time for the Ycombinator winter application, and would love to expand the team.
The startup project is finance-related (forex, stocks, options etc.). If you are interested, do contact me at stepwok|gmail.com and i will provide more details about the project. If you are a regular at elitetrader.com/nuclearphynance.com, we would love to hear from you.
rewriting code isn't as bad as some would claim. Because the logic of the code has already been set, a rewrite of the app in another language should take no more than 2 weeks. This is esp. true if your app uses an MVC framework where the view template is separated from the logic.