Having lots of short stints at different companies also grows the pool of people to choose work-related friends from. And it increases the likelihood of ending

Having lots of short stints at different companies also grows the pool of people to choose work-related friends from. And it increases the likelihood of ending up in a good workplace with fun people, since your pool of companies to choose from expands. There are lots of reasons to bust out of local maxima besides "chasing money". (Which, incidentally, nobody but computer programmers uses as a term to describe negotiating a fair market rate for one's work. Everybody else would call that "not getting taken advantage of.")