One of the ways scrubbing is done is by bank code. So even if your card is perfectly good, your cc may belong to a bank code that has had a bad history with a particular processor from fraudelant users using that bank code. Unfortunately the honest people with the same bank code may get rejected, not because of you personally, but because of your 'unwitting' affiliation of your bank code.
That said, I haven't had a problem joining a ccbill site thus far
