So every one will be under investigation by the new forum gestapo or just active sellers?
Be careful that you do not become the issue of the forum by doling out your brand of justice here.
Its a slippery slope and I know a lot of the ole folk use multiple accounts to push things and make people feel stupid for saying contrary.

Having to prove legitimacy is a interesting issue. If I was questioned out of the blue by pm by some one that is not in the transaction,I would tell them to piss off! Its one thing to ask but another to neg rep a person because they do not play your brand of baseball.
Would it not be fair to list all alt accounts and business you transact in as well if you want clarity?