I've rarely stayed with a position longer than 2 years. For me, it's usually a simple matter of economics - why would I stay at Company A if my bonus/raise bar

I've rarely stayed with a position longer than 2 years. For me, it's usually a simple matter of economics - why would I stay at Company A if my bonus/raise barely overcomes inflation, but Company B is offering me 50k more per year? There's also the false advertising factor. Almost every company I've worked for has promised an exciting environment developing new things, and in reality after a few months almost all of my time is spent maintain some crusty old platform that no one wants to improve again. If I'm not getting the experience and career growth I signed up for, there's a lot less motivation to stay.