Yeah just depends on your goals/place in life. I imagine once kids come along I'll start growing more roots, but for now my focus is on my fiancée's and mine careers. And right now I'm at the best software development job that doesn't require a 1-hour commute. So while I could chase pay-grades for the next 30 years and make a decent run of things (plenty of my coworkers have), I kinda see that as a path to career mediocrity.

I agree that moving around makes developing strong ties tough. Once I get further along I'll reconsider taking my foot off the gas a little. My standard is essentially: "If I was trying to convince my kid to go into engineering, would I use my job as an example to aspire towards?" Right now, while I'm grateful for my job and the work certainly isn't bad, the answer is no.