Disagree. Bitcoin does not gain any kind of 'support' from signature spammers. While there are a few (but rare) examples of decent participants, most of them (99%) just spam for money.
So just for full clarification... the general idea of what happens here with account farming is:
1 They create or buy XX number of accounts
2 Join them all to signature campaigns (maybe? I believe this lowers the value of the account?) and start posting whatever they can, as fast as they can
3 Sell them to the highest bidder when they have some type of value or reputation, presumably to someone who wants to scam or join signature campaigns themselves.
If so, a 2BTC charge on the 'Supporter' status means they can still technically get or create accounts, and still post nonsense and crap for the purpose of gaining higher status accounts for reselling, just without a signature campaign, obviously making less money in the process, but they should still get something on the account sale which I assume will keep them going.
Accounts being sold with a 'Supporter' status are just going to be marked up 2BTC more to cover the cost? I guess it depends on how willing someone is to buy it... or how willing advertisers will be to increase their payouts to offset the costs and continue their marketing campaigns?