Bind on Account
From Diablo Wiki
Bind on Account, or BoA designates an item that "binds" to the account of the character who first picks it up. These types of items could be passed between different characters on the same account (presumably by using the shared stash), but could not be traded to another other characters.
Reaper of Souls employs extensive item binding, and makes untradeable all legendary and set items, all crafting materials and crafting plans, and Marquise and higher quality gems.
- Trading Exception: Set and Legendary items (but not plans or materials) can be traded for 2 hours after they are found, but only to players who were in the game when the item was looted.
Fans were generally supportive of the item binding changes when first announced, since the logic was that item binding = much higher drop rates. Binding has become more controversial since Reaper of Souls' launch, as many fans claim to miss trading and agitate for some forms of trading, even if only through Clans or in other limited fashion.
Item Binding Timeline
There was no item binding when Diablo 3 launched, as the developers felt trading and a free flow of items in the economy was an integral part of the game. This topic was much-debated pre-game (see section below) with some fans arguing that item binding allowed for more or better quality items to exist, while other fans wanted self-finding bonuses.
Item binding first appeared in Diablo III in patch Patch 1.0.5, in the form of the Infernal Machine. The special keys and the demonic organs required to assemble the Hellfire Ring were all BoA, as was the ring itself. This forced players to assemble the parts themselves and made it impossible to buy or trade any of the portions, though players with powerful characters did sometimes sell rushes or allow weaker characters to ride along in the game while they killed the Ubers and earned Infernal Machine ingredients for everyone in the game.
Early Bind on Account Stance
While the developers mentioned the possibility of BoE or BoA on items in Diablo III, they ultimately decided against any form of item binding in the game.
Prior to that decision, BoE was expected, while BoA was considered unlikely. The theory behind item binding is that when top level items can be traded, the economy gets glutted and eventually every character has the best of everything, since characters who indulge in huge amounts of item finding (or illegal duping, in the case of Diablo 2) will score enough of that item to distribute them widely.
Compare BoA to BoE -- Bind on Equip which is also known as "soul binding." These types of items bind to the character who first equips them; they can be traded, perhaps only within the same account, but once any character actually uses the item, it is bound to that character permanently. (Characters can dispose of such items for space considerations, but they can not give or trade them to other characters.)
- Jay Wilson: We have no “Soulbound” or bind-on-pickup, except for quest items. We do have bind-on-equip for the highest end items in the game. We targeted, roughly, any item above level 85. These we will do as bind-on-equip. The reason for this is that we want people to be able to trade them, but we also want to remove the high-end items from the economy. One of the greatest ways that you can do that is with bind-on-equip. What we don't want is to have a situation where you find something on the ground like, “Oh, man. This would be a perfect weapon for my Monk. Oh, but I just picked it up and now it's on the wrong character.” We don't want that at all.
- Most of our focus on Diablo 3 is as a trading game. So, if you take trading out of the item space, you ruin the core of the game. Finding a really great item that is not for you is still a great event because it means you have a bartering tool to get the item that you do want. We definitely want to make sure that that still exists.
Bashiok addressed this issue during a mini-interview posted as part of Blizzcast #13, in February 2010. 
- Bashiok: Maybe. It sounds kind of cool. So I asked Jay and some of the other designers about this actually because I wasn’t sure, but Jay’s response was “That sounds awesome!” And he likes things that are awesome. Which is a very Jay Wilson quote. But there could be economic reasons that we don’t do that, there could be gameplay reasons we don’t do that. It’s probably too early to say, but that sounds cool so we’ll have to see.
Bashiok elaborated on this later that same day, when a fan pointed out that BoA could lead to stagnation in the economy, if every account eventually had several of the best items that players could pass around between their different characters. 
- Totally, which is why I said “But there could be economic reasons that we don’t do that.”
- It would probably stagnate the economy… UNLESS, there are other systems in place that could make it attractive for players to essentially destroy their BoAs. So I don’t think it’s without solution at least, but it could get sticky if not balanced or pulled off just right.
- Anyway, we’re not really seriously considering BoA items at this point in time.
Binding was finally ruled out in April 2011, by Jay Wilson in an interview with Diablo3.cc. 
Addition of Bind on Account
- August 2009: Game Director Interview by G4TV.com.
- February 2010: Bashiok on Blizzcast #13.
- February 2010: Bashiok forum post.
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