You mean spamming? I wouldn't call my posts spamming as they are on topic and why spamming should be a problem if admin allows It? If It would be a problem admin could ban signature campaigns or make them not paid per post and account selling/buying and there would be no point to try making  more posts for bigger profit?

Some new bitcoin users comes here and buys an account to lift restrictions or especially for signature campaigns, so what's bad about It? There could be at least a warning message that I can't post on that much accounts anymore so I could stop and sell them for other users.