I think it is probably because it is a controller, no need to continually report numbers for it.
As long as the Move titles keep coming from SONY we can be pretty confident that the sales are just fine.
It's not a contest.
iPhone = Great gaming device. Don't agree? Who cares, because you're wrong.
Currently playing:
Final Fantasy VI (iOS), Final Fantasy: Record Keeper (iOS) & Dragon Quest V (iOS)