I got this too. Was 1K for 4 years, then PremEx, then GM, now 1.5 years at Silver...
Total balance PQM at end of 2012: 42400
PQM/PQS amount needed: 8000PQM/8PQS
$1399 for 8000PQM
I got the "add PQM" offer the last couple of trips, but I'm 140K from MM and if I'm paying for miles, I want them BIS miles. I'd considered a MR which would have been $500 and decided it wasn't worth it. So now, at $1399, it's *really* not worth it.
So I'm still Silver.