Account bound items ruined MMO's for me. Used to play EQ pretty heavily back in the day and never bothered with WoW because I knew they used a copy-cat of the same flawed mentality, when the items started becoming account bound I stopped playing.
They take away the sense of community, it promotes waste and no sharing. You get a great item, then a month later you upgrade, and that item is now useless. You can't help a buddy out, you don't get to play the "Hero".
The personal satisfaction of truly helping someone out (and in this game that's straight up loot) no longer exists.
In Diablo 3, I see this purely as nothing but a waste of time and gold, nothing more, and yes it's "our option" to partake in it or not, and I will not take part in it because it's a flawed philosophy originally designed to prevent botters from taking advantage of a system that did not endorse the selling of digital items.
Now I've been quite open to the direction the Dev's have taken with this game for the most part (although I rarely play at the moment due to boredom), I still had hopes that eventually the game will be fixed. This Account Bound item thing is the first indication for myself that the Dev's are taking the wrong direction, they have no original thought and are just copying methods from previous games, that 100% don't fit in this one.
Like seriously, Account Bound items were to prevent people from selling stuff for real money, now they implement a game where you CAN sell items for real money, and they still copy this methodology? Now I don't use the RMAH, but I use the GAH, but it's the same principle... they offer a way of selling off what you get in hopes to get something you want (because this game is designed around the fact you never get something you actually want/need dropped and you need the AH.
Forget the fact I have the choice to use it or not (I won't use it), this line of thinking is completely contradictory to the game they developed, there is no logic at all.
If they want gold sinks and time sinks, then just make more things like their new ridiculous level tiered gems (another thing I'll never see as a casual player), and introduce more casual player gold sinks.
The fact Dueling and PvP will never be about skill and only about how much money you spend, I'm seriously disappointed with this new patch as it introduces a whole slew of features I (as casual player) will never partake in.
I can no longer figure out who they're designing this game for, other than the multitude of botters.