I personally like South West. I feel my chances of getting the seat I want are much better than with other airlines. I guess if I always knew I was flying 6 months in advance it might be different, but I always have a hard time finding a decent seat on the other airlines. It always seems that by the time I go to book my flight all the good seats are gone and middle back of plane is all that's left. At least with South West, I know that if I check in 24hrs in advance I have a chance. Also, with planes not all being the same size or layout, I like to see the actual seats, not just guess if one is over the engine or not from a diagram.
Personally, I'd move for someone else if I could, but I'm just one of those self punishing peace-corps people. I've always felt that my responsibility is to others not to myself, and if I can help someone, than its my responsibility to help them. So many people have helped me over the years, whether I deserved it or not, that it is just my way of paying all that help forward. I just personally feel that I'd rather help someone who doesn't need or deserve it, than not help someone who does because I'm worried about being taken advantage of. I feel God knows their hearts, and if they are in the wrong, he knows it, but if they aren't and I don't help, then I am. But having said that, I get that there are many other people out there who feel differently, and I can respect that. Also, as many have stated some have good reasons for not moving, so we shouldn't assume, just because they refuse to move, that they are a jerk.