I'd love to know if that letter you wrote makes you a serial complainer in their minds...
My wife and I were bumped off a flight (semi-voluntarily) through some confusion on Saturday night. Basically, we offered to volunteer to get bumped off a red-eye on CO in exchange for compensation that wasn't defined at that point with the understanding that we would take a later flight on AA that night. As the gate agents finished check-in, they realized that they had double-booked a seat, and spent the next 15 minutes trying to unravel that mess. When they got back to the oversold situation, they took a look at the list of volunteers and let the plane go...except they forget to let us know what the compensation was...When they said $250, I said no, and then they admitted that it was too late and that the plane was gone. Then they realized that they couldn't put us on the AA flight b/c AA doesn't allow bumped passengers from another airline who checked luggage on the first airline (post 9/11 security). So we had to stay overnight and fly back the next morning.

Since it was end of our honeymoon, we weren't thrilled with the circumstances. I wanted to complain, but have had several major problems with CO this year and didn't want to add this complaint to the list. I let my wife handle the argument through her Gold Elite # (I'm Plat) and was able to read part of the PNR the next morning. Based on what I read about her complaint, she won't be a popular person in Houston--"Customer changed mind after agreeing to vol bump", "Cust accepted compensation, now complaining", stuff like that.
It would be weird if the next time she asks for help on something, they reference this situation (either implicitly through their service or explicitly though asking her not to volunteer to be bumped again)