For better-or-worse, we tend to stay at Harrah's resorts, and part of that is the offers.
I would not consider my wife or I big gamblers, but I will spend a lot of time at the BJ tables (i.e., I've done 15 hour sessions; I've got good discipline when I'm down, but piss-poor when I'm up). I'm typically a table-minimum better, but have been known to bump it up if the PB is hanging around. (A big win or loss is $1K over 5 nights, fortunately, I'm somehow, as a BS player, up).
We visit 1-2 times per year; we frequently get offers from Harrahs that would allow us to stay anywhere from free to more depending on where (i.e., Bally's through Ceasers). Rightly or wrongly, we typically pick Paris; we actually like it better than Ceasers, and haven't got the deal we want at Bellagio's (we have stayed there, any hints for a good deal?)
It seems to me the biggest mistake people make is not picking up a players card, and giving an e-mail address to get the offers.