Im sure they appreciate you posting in the Forum that they are doing something that may be against the rules and possibly even ban worthy.
buying and reselling on the Gold Auction is NOT against the terms of service my friend...
That is only *partly true.
Here's what the AH FAQ states:
If I no longer need an item I bought in the auction house, can I relist it in the auction house?
Yes. Once you've purchased an item and sent it to your stash, you can do anything with it that you could if you had acquired it through your own adventures. You’re free to use it yourself, or trade it to another character or relist it in either the gold-based or real-money auction house. In fact, you can generally do any combination of these things -- for example, you can purchase an item in the auction house, use it for a while, and then relist it or trade it to another character. Aside from certain quest items, there will be very few (if any) items that will be “soulbound” to your character and therefore untradable.
Here is another part to this:
11. RESTRICTIONS AND CONDITIONS OF USE.
.......B. You will not:
.......... - (iii) use the Auction Houses as an investment vehicle;
So, it's not as cut and dry as we would like it to be, since they appear to be contradicting rules.
Having said that though, everyone flips items, whether it's 5 seconds after you purchased something or 5 weeks afterward, and clearly no one wants to sell for a LOSS, but selling for a gain doesn't necessarily mean that the original purchase was used as an "investment vehicle."
In addition to that, though, the "investment vehicle" term is a loophole for Blizzard to essentially ban anyone for anything regarding either of the AHs for any reason whatsoever.
People can and probably do flip items for whatever reason, but if Blizzard sees something they don't like, they can invoke the "investment vehicle" clause if they wanted to and ban ANYONE at ANYTIME, and no one would really be able to do anything about it.