I tend to agree with the overall results of the study. The top four reasons for working at a specific company are very much the same reasons I have for working somewhere (not necessarily in that order). Most people work to get a paycheck, which is perfectly valid and reasonable, but if you can get excitement and challenge from the work you are doing, its a huge huge bonus. Additionally, if you like the people you work with, another enormous bonus. Career growth and development is usually what keeps people at one particular company for any extended period of time (3+ years by my estimates). As any of these things diminish and the time spent increases, the likelihood of staying put decreases dramatically.