Notwithstanding the policies it is frustrating to see crew in a higher class than you when you were hoping to get there, even if for "free" (or semi free if eUpping). A couple of months ago I was on an oversold 777 LHR-YYZ and hoping to get opUpped as there were definitely spaces in PE at T-60mins. It was frustrating to see an FA (admittedly in uniform) in the (middle) PE seat I was hoping to get particularly when she spent the whole flight climbing over the passenger next to her to go chat with her friends working the flight. In seat, out of seat, in seat, out of seat constantly. (I was in 18C so had a good view of all this). However, I really couldn't complain could I as I really wasn't "entitled"?