What drives you towards staying with your employer?

Applying a positive spin to the quote below, it may be that good people stay with good employers because of things like having a good boss and work/life balance. What drives you towards staying with your employer?

Results from the recent SearchCIO-Midmarket.com salary survey show that 30% of survey respondents left their last job due to “dissatisfaction with management.” This beat out company downsizings or mergers (18%), a change in a role or position (15%) or work/life balance (14%).