Companies? I can't think of too many people who do more than 1,000 joins a day, much less 'thousands.' VISA registration won't stop these people from finding 10 different guarantors, and forming 20 different corps, if they're doing that kind of money it'd be pretty tough to deter them.
If they're running a program though it'd be difficult to explain why a couple payouts are not happening, and you've changed the name on your checks a couple times. Oh wait, a few places have done that already.
I disagree in the sense that the people who have the most to lose are the small fries. It only takes 5 chargebacks to send someone with 5 sales a day into the red. Most merchant banks say 3 months of consistent high levels, but what do the IPSPs have to say? From what I read it was 1 month, correct me if I'm wrong. Big boys can suffer through quite a large number of chargebacks, or even buy additional traffic out of pocket to compensate. The smaller webmaster who is making a decent salary off their paysites has no recourse.
C.