Where have all the moderators gone is what I want to know? Used to be if enough people clicked the yellow triangle to report the spammers, the posts would disappear. Nowadays it's hard to know because they have become so brazen with their advertising, and there are new ones popping up daily.
I don't think this board is on the way out, and I don't think the spammers have any power to make people leave here.
I agree that it is tempting to post something like, "spamming isn't allowed" to the spammer, but that just keeps the post alive. If we all just completely ignore them, they won't find it productive to post here, and they will eventually give up. (fingers crossed)
Anyway, they are annoying, but there is a lot of fun stuff on this board, and they can't influence that.