Why an Auction House is IMPOSSIBLE. Guys, get realistic. There is absolutely no way an AH could be viable in D3. Let me explain in point form since I don't really want to write 10 pages. - The obvious one: searching for items will be very difficult due to affix system. There is no solution anyone can think of to address this issue. You can't filter by name, and you can't filter by mods (there are what, 1000 affixes to choose from?). What are you going to do, select the stats you're looking for out of a dropdown menu of 1000 stats? Keyword Search for affix stat name? That will require a lot of research and knowledge, and doesn't work for rares (since the affixes are invisible and/or different to magic affixes). Not to mention there is no way Blizzard would do that as it is extremely counter-intuitive, and not casual friendly/accessible. - "Searching" for the item you want will yield tens of thousands of results. Since a lot of filters are impossible to implement (as described above), There are no "realms" in D3, only regions. This means that you can expect 20-40x the population of what a WoW realm would have. And no binding system (which means every item can be put in the AH, now imagine that was the case with WoW. There would be 1000x more items in the AH.) - Pricing of items will be impossible to set and predict, resulting in massive sporadic item values. When there are 5000 "cruel Collossus blades", the first 4999 that are listed will be undercut, and/or listed with totally different values. Now add the fact that the %'s are variable, and you end up with one giant economic mess. On an economic standpoint, supply and demand cannot regulate prices like this. - Chinese farmers: They will destroy the D3 economy as it is not protected by a binding system. An AH will allow chinese farming businesses to list tens of thousands of items, and then go straight back to farming while they sell. With an automated selling system (the AH), they can list items without restriction, and do not need to communicate and haggle pricing. This allows them to sell efficiently, and drastically increases their profitability, which will cause more of them to farm the hell out of D3. REMEMBER: FARMING IS NOT AGAINST THE TOS. So they cannot be banned. - An AH with a using population of 2-5 million users (each selling dozens of items) is not going to work. Both technically and theoretically. - How do you value your rare phase blade that has 270% ehn dmg, 4% life leech and +20 to vitality, +46% CR? Do you look at the other 5000 rare Phase Blade, in which one that has 285% ehn dmg, 10 Dex, 20% IAS, and +5 to max damage listed for X amount of gold? What about the other 4998 phase blades all selling for totally different amounts? How on earth do you know where you stand? No two items are alike. Now times this by the thousands upon thousands of random items with similar stats? Again, supply and demand cannot set prices in this type of situation.