I'm saying they wouldn't even pay the 2BTC for the status... they just spam on accounts with no signature until they get high enough to get some type of value for the account, if they get banned for spamming, its just lost time. Eventually they either sell the account without 'Supporter' status or they purchase the 'Supporter' status right before they sell the account, and subsequently mark up the price of the account and advertise it as "having Supporter status"
-snip-
They could also come up with workarounds to the situation and start paying people on just mentioning their company name in a post...
Quoting Lauda from earlier: "We don't need a perfect solution, we just need a good one."
I would also question what the advertisers are going to do when they see a drop in people using their advertisements. Advertisers are paying out for a reason and I'm sure they are making money off of these spammers in some fashion so I could see them increasing payouts, they are going to have extra funds anyway when the numbers drop in people using the signatures.
Yet, there currently are advertisers which get along maintaining a substantial campaign without producing mass-spam on the way.