I don't see the problem. They're looking for groups to clear dungeons, just not the way you want to clear them. You're post, no offense, has some contradictions in it. You don't mind people playing that way, but it's obviously abusing the system? What? You seem to have your own idea for what the "intended" use of pf is for that is really off the mark. It's just to find groups. Pf doesn't care if it's a sale or not.

I can understand being annoyed, but this is just one of those live and let live situations. It's an online game and people are gonna play it their own way. It's not that hard to scroll through pf reading the descriptions