If they're known to scam customers, I doubt that their community will take off. People will research you when they offer such sums. You can, of course, start an

If they're known to scam customers, I doubt that their community will take off. People will research you when they offer such sums. You can, of course, start anew, but it will take a lot of work to get back to the reputation level where people are trading 7 digits with you. Getting banned from the forum is more of a gesture, the impact is a lot larger. Of course, it's a different topic if the decision was against them for clearly unfair reasons.