I place a pretty high value on Platinum because I use miles for family travel (and with Plat, those miles can be used to buy refundable tickets at the same mileage cost).
Accordingly, I did 2 pure mileage runs, 2 other trips that I would not have taken if I did not need PQM's (but where I did something other than fly on the trip), and bought some PQM's.
This year, I will buy exclusively premium cabin tickets for my non-work travel, and will do a couple mileage runs. Just got back from Detroit on a MR. Booked a non-stop IAH-DTW in A class and was able to SDC to IAH-DEN-DTW on the way there.