Pretty much why 96% of the moaning fanbase needs to just get over the fact that he's going to keep playing. In the world of football you get managed according to performances by the manager himself. Not the whinging fans.
They run the business and no amount of moaning about his wage (not you, subsequent discussion) is going to change the fact that he's going to get an opportunity to come good. Running to the previous point you made about 'just getting rid of him before the season started' that would have left us with Zaha who just joined the club, a Nani who was trying to re-establish himself in the team and Valencia who is tailing off from his post injury boom. Selling Young would have been shooting ourselves in the foot. Rolling the dice on Januzaj has come up trumps but there is no way a new manager could have foreseen that without having a backup plan.
Personally I think it's hilarious how much the fans hate Young. Makes me smile everytime I see this thread and the dirge in it. Get used to it peoples, you're not the manager. Moyes is and he'll be selecting him throughout the season for whatever reason. If he doesn't and you get your way then thats okay as well, I'm sure he'll have another good reason for that. Other than 'feck it, sell him, shit player, totally rubbish, big wage, overpriced' because honestly, who cares about that. It effects the fans absolutely nil.
I am not having a go at you in general. But this whole 'Januzaj is the Messi-ah' is a bit much.