I have a solution. I think twinks ruin the game as well. Simply get rid of the buyout system in AH, sure then prices for twink items may skyrocket because other twink players will be constantly upping the item price, but then twinks will spend so much time hounding the AH that they wont have time step foot inside a BG because they'll have to keep an eye on their auctions.

That would have a pretty negative effect on everyone else trying to use AH as well though.

Blizz knows how to limit the impact of twinks in the game  All that would need to be done is put levels on all enchants and gear upgrades (as they have with the ones from TBC).

Either it is too much work for them to be bothered or they think they may lose the players who play twinks.  As new players will move on to higher levels the only people this would really effect in the long run are twinks (and those few who claim they NEED to twink in order to level up...).