This seems like an awesome idea
I especially like the fact of being able to trade traffic for other traffic types. That alone could be a site idea in itself, however combined with the banking option should be can't miss
Do you foresee any dating traffic coming through ?
Also, once things are running smoothly, I think you should contact someone like AVN to try and get a story about it in AVN ONline magazine or something....they are always looking for stories on new technologies/ideas.
Good luck, hopefully your script is rock-solid and cheaters won't be a problem for you.