I always make all flights arrangements for my Mother, as she is not a very confident traveler - but knows how to follow my "trail of bread crumbs" so to speak to get happily from A-Z.
Had her booked into 1C out of DUS a while back. She was boarded, seated, and settled. Some guy came to her and said to her that she needed to take his seat in row 3 because he needed to sit next to his wife and "because I fly a lot and I always sit here". Sadly, I did not find this out until my next check in with Mom during her lounge stop-over (she had already turned off her mobile on board). She said he flashed a "shiny card" in her face and basically just stood there and hurried her along. She went to row 3.
So apparently some people are OK with getting to row 1 no matter if and how and when the seats might open up! It made me so mad that someone would have the nerve to do that (and to a pensioner to boot!)
Anyway....sorry - I know it's slightly off topic. Just wanted to share....