For starters no catagories fit the AH. Make one.
What are the rules for people who monopolise the AH? Ie buying everything off of it and replacing it at 200 300% higher with everything
This forum is for issues with the Support website for Blizzard games.
https://us.battle.net/support/en/
If you wish to discuss the WoW Auction house you can discuss it with your fellow players on the WoW General Discussion Forum
That is where you post about WoW topics that don’t have a specific forum listed for them.
I will say though, that from a policy standpoint monopolizing a commodity (or more) in the AH is not against the rules. It is a very free and unrestricted market.