I'm with Jugger as for what hatters should cost. 400-500k for a hatter card is ridiculous.
As for making Anubis and Hill Wind hatters, I honestly see pros and cons both ways. The major upside is, obviously, people have a lot of these just lying around and rotting. Supply far exceeds demand, so putting demand up on them would be a good thing. Plus, it'd mean several free hatter trips for lots of people, which would be awesome.
On the other side of the coin, as has been mentioned, if these are popular grinding monsters now, making their cards hatters could mean their maps will be absolutely packed. There's already an uncomfortable amount of accidental KSing on these maps because of their popularity, and I can't imagine hattering them helping things in that regard. Hill Winds in particular would be bad like this, because nobody parties there, and we need more incentives to party around here, not stronger incentives to solo.
So for Hill Wind, I don't think it should be a hatter. Anubis, I'd say the pros and cons are about balanced; people party for Anubises, and they aren't mobbable like Hill Winds are, so they're not near as bad.
Didn't vote in the poll as there's not an option corresponding to my opinion. XD