Its only easy to consider the main point if you take 'Brighton' and 'Palace' out of the equation. If you played for Burnley and then Preston offered you more money, would you go? If you played for Derby and Forest offered you a better deal, would you go? Its not so black and white in these cases.
I understand where you're coming from, but even from a neutral point of view, I don't think I'd go from one to the other. Personally I don't think I could deal with that many people despising me, especially as most of them had adored me for the previous couple of years. For example, if Ricky Lambert went and signed for Portsmouth, I'd think he was an absolute idiot. And that is from a completely neutral perspective, whereas you'd expect that a lot of players would have a slight preference towards the team they play for, it's natural to do so (and by that I don't mean loyalty, I just mean caring a small amount for said team)
Also, as brought up earlier - if my wage was to raise by 2k a week, I'd have increased my wage by more than double what it is now, so of course I would move. However, I'd like to think that if I was in a job that I enjoyed, earning far more than 6 figures in a year, then unless the new job offered far more exciting opportunities to me, the extra money wouldn't mean an awful lot and I wouldn't take it.