That's not true .
Pretty sure I have the right to re-enroll as far as I know , was speaking with Marcotheminer on Skype and asked him if rules changed etc ... he said no , all I need to do is re-enroll and that's it (and he know I was banned) . so you are wrong
The mods, and some campaign managers, are clamping down on prolific spammers so it shouldn't be much of a surprize if you are denied payment.
I think it's great we can earn a passive income from making constructive posts but if people (not necessarily you) keep clogging up the forum with spam posts the sigs may get removed completely and then nobody benefits.