I honestly don't understand the hype about SATA 3.0 I mean hard drives hardly break 300mb/s under raid.
SSD hds
SATA2.0 chips will start getting more expensive as 3.0 becomes more popular.
If you had a SATA2.0 3TB hd and the competition had a SATA3.0 3TB and there was only a $10 diff and they get ever so slightly better results... you don't sell crap and you lose money.