I just got my Hyatt GP summary, and in looking through it noticed a 20% bonus for purchased miles. If this has been mentioned, I hadn't noticed it. Brings the cost down to 2 CPM, which isn't bad if you can use your point at low point properties. I often find 5k properties in Indonesia where booking with points saves me 50% on a paid stay. Offer says it's good August 18-Sept 30th.