I don't know what forums you guys visited but most of the ones I go to are pretty strict and well monitor. I have reported many spams and scammers but none or most are not taken care of. I understand it's a volunteer job but if you're going to do it then do it right.
How about some links to spam still around the forum?
Note: Developers are allowed to promote their apps in the appropriate section - so if you've been reporting app threads in the iPhone and iPod Touch Apps or Mac Applications forums, nothing has happened because they are allowed to be there.