I agree with
Repooc17 - It's quite complex to really calculate with bonus nights, counting redemption nights in your total (I remember when they didn't), bonus nights via promos, credit card nights, rewarding events etc...
In my case, my simple average for 102 "nights" is USD145/night. However as 30% of my nights are bonus/redemptions (no credit cards or events, but a generous double up promotion), the actual paid amount would be just shy of USD200/night for my ~70 really paid nights. Since I stay primarily in Asia where room rates are lower I am still staying at full service brands for the most part.
Still, I'm lifetime Titanium and unlikely to hit Ambassador this doesn't really matter though all that much, I just enjoy my stays at the chain, especially the "new" SPG chains like St Regis
.