There are a few twinks, but I believe there aren't many yet due to the server still being pretty new. I do believe, the twink community will grow the older the server and the more people are bored at 60.
Yes, i saw a few twinks items in the AH... not bought. Even for as low a nearly dez value, they aren't bought. So, i suppose the twink community is not active yet.
There is a twink guild on PvE server <Critical Damage> Alliance. Most committed twinkers are geared but what is a good piece to sell is Shadowfang from SFK.