It's an interesting thing for me. I would never sell any of my accounts, I like all my characters and have spent too much time on them (at least to me, /played of 10days is A LOT to me). I also have done RAF ad nauseum, to the point that levels 0-70 will make my head explode - selling my accounts and having to do that all over again would be pointless unless I was in a dire financial situation, or my cocain addiction gets the better of me ( j/k ).

I used to buy and sell accounts back in the Vanilla days. The reason I did this was to try out the different classes without having to level to 60 over and over again. It also allowed to me to get a level 60 character with already decent gear so I could join higher level raids and pvp without having to grind out instances or raids and save dkp. If I got bored playing a mage, I'd sell it and get a rogue. Most of the time nobody knew the account had been ebayed, and if they did, they were cool with it (since I didn't suck ass).

The only reason I stopped doing that was because of multiboxing. I can level 5 characters at once all 5 different classes, and boom - after two groups I can then play any class in the game. I can switch between melee and caster classes, if I feel like healing or tanking I just jump on the tank or healer and PUG.