I have no problem with people moving into better seats if it's not affecting me. If I happen to change my own seat, I don't generally ask an usher because then I run the risk of them saying No. I would rather get in trouble and be told to go back to my original seat if they catch me and it's a problem.
I also don't make a scene. I don't move into center Orchestra seats because those are generally house seats and you never know who might show up for Act 2.
ONE time I moved to center mezz seats during intermission, and they ended up being Julie Andrews' reserved seats. Oops
It was for the "The Boyfriend" at Goodspeed Opera House.
I DID, however, ask an Usher because A. I knew for a fact Julie would not be there, and B. there were some old (slower) ladies who tried to move there and were peeved that my friends and I got them first. So, rather than get in trouble, we asked and were therefore allowed to stay in them.
City Center I moved. You can't see anything in those balcony seats. I try to only buy Orchestra at City Center, otherwise it's not worth going. The one time I took balcony I regretted it.
"It's the little things; the details, that distinguish the Barbra Streisands from the Rosalyn Kinds."~Gilmore Girls~