I personally agree with what most are saying. Its not necessarily a # of auctions, but a # of the same auction along with consistent postings. If you keep 10-20 of a given item posted 90% of the time or you're the undercutter that everyone hates, you'll get random pissed off reports that could lead to investigation. I'm not saying I'm right by no means, but no one likes a monopoly on a certain item or a rediculous abundance (posting 1 of a dust that takes up 10 pages in the AH). I do know I've been posting over 400 various auctions a day for 3-4 months, I sell around 68% (the remaining get relisted a few days later) of the items I post and I've yet to be banned.