As long as their policies didn't change, you can camp the AH as long as you want, control as many markets as you want.
I've been in full control of my servers gem market (alliance and horde side) for several years, set the prices as low as I wanted (started this cause of stupid high gem prices and the market being controlled by some tools who thought its fun to rip others off like that).

I got reported a ton, for botting, for being a gold seller, for controlling the market, for multi-boxing, for making fun of my competition, and so on. I've talked to several GMs, all of them said its totally fine what I'm doing, they'd wish they had the time and dedication to make that kind of gold too (I had 10million at the end of cata without even trying, cause I kept the prices very very low).