I kinda would have liked meta-achievements if they were the ones from the summer 2011, but I guess the prize booth rewards are all up to the devs to make if valve wanted to do it. I certainly don't want the coal farming travesty that was last year's winter sale.
In fact, you could probably blame the achievement manager for making getting holiday achievements trivial (and I doubt valve wants to go to the effort of having to revoke them). I mean, there are still holiday events going on in Dota2, NS2, TF2 just had a big content update, and Killing Floor also comes to mind. It's not like valve canceled Christmas in any fashion.
Honestly I'd rather just play the games I wanted to buy than suck it down and buy an indie game I won't touch after getting the achievement. Achievement hunts are fun but they definitely couldn't think of a good system to reward actually obtaining them and mitigating exploiting/abusing the system and ruining it for the rest of us.