Employers want specialists, and pay for them. If your CV is two or three distinct things (I don't mean a selection of languages, or front and back end dev here, I mean distinct skills like say programming and accountancy) it's very unlikely to get you a better salary.
In fact if you've diverged from a straight specialism throughout your career it's probable you'll be punished with a lower salary, and problems getting hired in the first place. Expect a lot of challenging interview questions as to why you haven't followed a straight line from junior, through senior into project management (which of course is a different skill, making this even more inconsistent).
I'm sure those same disparate skills could be hugely useful if you're starting a business or startup, but for employment it's likely to make life harder, even though many employers would benefit just as much from your increased breadth of perspective.
So outside a few rare employers, and a few lucky applicants, I don't think there's much out there for generalists, sadly.