Have experienced that a few times from really motivated CSDs when I'm in Y or Y+.

Only been moved forward a couple of times once in CE and once to WT+ as I recall, but better food and drinks have come back to me most of the time, or a row protected for me to sleep in, or the seat next to me kept empty ^

It is always most appreciated, but at the same time I am also happy to sit in the seat I have paid for.