At the moment, there are no demerits that would cause you to lose AP. However, if your comment is deleted, you'll lose all of the points you were rewarded. Over a large period of time, this could result in lose of rank. Getting kicked off or banned from Armor Games is a very rare occasion, and would only happen if you broke an extremely serious rule.
We do written warnings, and generally they are accompanied by point loss. I will go through and delete the spam that I've seen. If it is bad enough I will search for every post a user makes and review them all.
There are several problems right now, but I think a main one is members don't exactly know what spam is.
I didn't mean to sound like that. I wasn't trying to, it is just hard to tell emotions over the internet! Well, maybe you should read the rules, just so you don't get in trouble.