This would only be a temporary phenomenon, until all spam and all spammers are out forever.
The more spamming is going in ANN threads. All the bounty hunters are not spammers but all the ANN threads bumpers are spammers. Therefore, you can't remove spammers at all, ever.
OK.
So in conclusion, if getting rid of ALL spam is not the plan, please remind me why I should continue to report ANY spam.