If I understand correctly, spam is most effective when it looks like real content and entices a user to do whatever the spam is asking it to (for example, clicking on a link.) Naturally, keeping a low profile would be essential to hiding it from the prying eyes of moderators.
However, what I've noticed in practice is the opposite. Spammers will use as many resources as possible and attack websites relentlessly, to the point where the service is no longer usable. With no real users to be tricked and the spam being so blatant that it can't possibly trick anyone, why would they waste resources doing this?
I understand the shotgun approach in which random websites will get hit by spammers. But I've noticed on certain websites, like chat websites, that the spam is targeted specifically towards that website.
How does oversaturating a website possibly benefit a spammer unless their intent was to make the website unusable for others?