I really see no reason as to hacking D3 accounts. The Real Money Auction House is a joke and very few people are going to use it, whether it be for end game PvP when it comes or just for getting the best gear possible. The majority of players are finishing off Normal or Nightmare modes, considerably less have cleared Hell and Inferno modes. Gold is so absurdly easy to get that if someone wants to buy gear off the Auction House, they can just use gold to buy it rather then real money.
I lol'd hard.
You must also think free2play MMOs with cash shops just do abysmally too, right?
Or hey, gold sellers must make a pittance since gold is so easy to get in MMOs.
Rich kids will like Diablo 3, and they will pay for anything they desire with mommies credit card. Why? Because people are lazy. They want to be amazing at a game, but they just really are too important and busy to play themselves.
Also a little trick in economics, if mob cash drops and items could be sold for around 5 gold, and making 10k gold would take a day of farming...an insanely epic and rare item may be upwards of 50k.
Blizzard realizes gold drops are really low (this would never happen due to economy destruction, bear with me hurr), so they amplify gold drops and item worth to sell to NPCs to about 5k gold average. Now getting 1mill takes about a day, low and behold, items don't STAY at 50k, they rocket to around 5mill.
Basically if gold is insanely easy to get, well, shit will be insanely expensive to buy. Making the RMAH, ESPECIALLY FOR LOWER LEVELS, incredibly efficient for a person (plus you can buy gold with it). Low level items sell for around 10-30k...I tried to equip my low level DH for cheap, yeahright. Shit my level costs about 20-50k, i'm level 53.
Simple concept.
Last note to make this a bit more on topic instead of half-assed on topic.
Gold sellers are ALREADY selling Diablo 3 gold, and prices are rising and lowering (meaning there is FLOW, people are buying stock and they're adjusting depending on supply and on demand). I've been watchin' out of interest.
So, reason to hack D3 accounts? Plenty. MMOs and online games with currency in an infancy stage are the absolute BEST times to sell gold. It's before people get a handle on what gold is really worth, and they can sell little for quite a lot. There's a lot of demand.