Yeah I've used <a href="http://www.freeticketcash.com/ps.php?s=ftc&u=omenterp">Free Ticket Cash</a> on a bunch of sites over the last year and 1/2 and they've done well.. comparable to WEG, but they will pay by Paypal
The most important thing I've found with email sponsors like this generally is to spend some quality time 'pruning', ie working out which sites convert poorly and then losing them, and just keep rotating the rest with a script in a moneybar or similar for your 'general' traffic.
Cheers.