Im an altoholic and i love leveling and most probably i wont even use the 90 boost with the expansion. But still whats the problem if some1 wants to buy a lvl 90 char in a lvl 100 expansion? Not giving him anything more than any wanna be hardcore qq cry baby player. Rly cant see whats the issue here...
If one day they start selling for example a hc end boss kill title - ok go moan quit the game and blabla. A mount/pet/partially lvled char in green gear are just another reason for "wow as it is now and not as it was in tbc" haters.