Arguably, "job satisfaction" is a factor as well, but... it's hard to have job satisfaction when you see others earning 50% more for doing less (or inferior) wo

Arguably, "job satisfaction" is a factor as well, but... it's hard to have job satisfaction when you see others earning 50% more for doing less (or inferior) work, especially if it's in the same company. And it's also hard to have 'job satisfaction' when decisions are made outside your control. I can live with fewer decision making abilities if compensated for in other ways, and that's usually pay rate.