My experience is that when you change job you loose a lot of friends. Or rather, it turns out people weren't personal friends after all. When I lost my job I was sad because I would loose the contact I had with a lot of people. But now I know who are my friends. They aren't many, but good.
If I would have made a career and continuously increased my status, then I wouldn't know, because it's only when you get problems you can tell who supports you and who's just around to look good.. or whatever reason.
I'll try to remember that if I become rich and famous one day...