Hi there, I think I read somewhere the auction house can present 1,000 results. Maybe I'm wrong or making it up 
So, I've recently been introduced to monster cards and I use the filter $notowned so it displays only, well, those I don't own. It consistently says it finds 1,000 cards (exactly, never above or below), and it can filter 50% of them. The actual number found is 361 (not sure if this varies). Anyways, seems odder than an odd thing.
I'm just getting into the game so I'm not sure if this is how it works. I use a thing call Curse with an addon for the auction house which is good, but not sure if this is tilting results. Do others get results like this or is it just my sparkling personality??!