For the past 3 years since I moved to green/black level I have played mostly unrated. Back in AC, I would play rated sparingly, just enough to get comped rooms and some food comps. When I moved west, I went to almost total anonymous play. Since I lived in Vegas, I didn't need comped rooms and quite frankly as a player moving from east to west, was a little concerned about barrings and backoffs.
Discussions of the topic in several different threads here and a few private discussions, including one member who was very adamant that I was leaving money on the table by playing unrated convinced me to give playing rated a try, so for the last 6 months I have played rated some. I couldn't bring myself to do so at a few of my favorite locations that I play most frequently, especially one of the bigger chains in the city for obvious reasons.
So after 6 months, here is my conclution: It's not for me. Not at my level and my style of play. I think if you are playing big bucks, spreading black to purple and beyond, it might be worthwhile. Sounds like Dye and Moo do quite well with offers and Mr Lee counts offers as part of his EV. But at my level, spreading green to black and especially playing very short sessions as I do, my offers haven't been that good. I don't know if the casinos are cutting back on offers right now, or my style and level isn't that conducive to getting them. Yeah, I got some free plays and some match plays and a ton of free rooms, which as I stated, I don't have a lot of use for. And in exchange I feel like I gave up that anonymitity that has worked so well for me.
And anyone who tones down their play, like lower spread to accumulate comps is making a big mistake in my opinion. You would be better off playing full spread anonymously, and pay for your own rooms and/or meals, especially at a time when rooms are so freaking cheap.
I have a few small local places that I have to tone down my action anyway, simply because they won't accept my mid black action, so those are the places I will play rated a little bit just to get enough comps for a few meals. Places, like terribles, or the stations, or tuscany. Since these places have good $4 breakfast, which is my favorite meal, I don't need to earn much comps and I'm not risking anything. And If I am indeed leaving a little money on the table this way, well that's OK, because I will be welcome back to pick up that money on my next trip.