I'm leaning towards boxing in the expansion.

For me, the choice is to either five box or quit the game. One-boxing has not been fun in a very long time. Sure with Dungeon Finder, you can do heroics. I've not had a serious desire to raid content in a while. I'd rather have several teams to mess with, one team to do most of my battlegrounds/heroics with, and the freedom to play or quit in the middle of an instance.

Also like the transmute/gold thing, more to see what can be done then to make a certain amount. Almost all the toons on my teams have epic flyers, so not really a ton to spend gold on that I don't already have. Three teams have slow flyers still, but they exist (at the moment) purely for the transmutes...