Some will always want to move on for more money or more glamour - but some of the good ones will want to stay - especially if Southampton is their hometown.
I'll always remember MLT saying in an interview (when criticised for not seeking a big money move). "All my friends and family are here. I earn £10,000pw, I have a 4 bedroom house two cars and if I retire at 30 I'll never have to work again. Why would I want to move?"
The difference between £500pw and £5,000pw is immense. After that its all a bit irrelevant and quality of life is more important.