Considering that 4-5 visits to KI would still pay for it, let alone if you are getting a Platinum pass you are most likely going to go to CP or another CF park, which a 3 day weekend at CP without a pass could run you around120 bucks, I don't see 179 as being over priced. Plus, there will be sales, and probably a discount if you renew.
Edit: On another note, it could also be a marketing gimmick. 179 marked down to 149 looks a lot better than 165 marked down to 149.