Paypal Sucks
If Paypal discovers that you are an SP and are taking money through their service, they will freeze your dough for 180 days.
This, despite the fact that Paypal started out as a money service for X-rated sites. The rules have changed though and they are very politically correct now.
I know of at least three people in Vancouver who have had thier assets frozen by Paypal and check out www.paypalsucks.com for other horror stories.