Guild Wars 2

If i bought something with karma such as armor sets. Could i transfer them to my other toon with the bank?

armorbought karma is, afaik soubound on buying it, thus no, you cannot bank it and use it on another char.

I would say an update that made karma trade-able through your account would be nice, but then again, why should my mean,angry warrior get the karma my lovely ranger has done so much good for?

Karma gear also reflects how much effort you have put into a character, what that character has done and achieved. Making it so you can level an alt to 80 with crafting and then getting it a full set of awesome dungeon armor might not be what ArenaNet want.