Independently that most people will calculate one complimentary night after two paid nights a (very generous) 33 1/3% return (let aside the fact that you paid nights might be in a lower category than redeemed night): It puzzles me that someone who is around for such a long period of time fail to materialize those very similar offers to his/her advantage!

If you don’t stay frequently at Marriott branded hotels, these two free nights offers (one Cat 4 reward night = 20K MR points) are more appealing than earning additional max 2K MR bonus points/night. If you plan to stay eg 20 nights between February and April ’11 (20 paid nights in three months averages 80 (!!!) paid nights/year) you may ask MR to change your target. Then after your 20 paid nights you will earn 40K MR bonus points instead of two Cat 4 reward nights for a minimum for four paid nights.