I mean isn't that how all militaries work, unless they rely on a draft? Even on the Russian side a very large portion of the expeditionary force is contract troops and PMCs (at least before the Wagner kerfuffle), not conscripts .
professional regulars aren't usually paid very well, its better and more stable than the prospect of un/underemployment, but they have to rely on benefits & patriotic claptrap as well.
Remember these people have internalized russophobia to a degree that makes them believe they're saving western civilization or some grandiose mission like that.
I can imagine other people doing it if you have the skillset, I mean pay can be pretty good but then I'm kind of wondering why go to an actual dangerous War instead of shooting at somali fisherman or just random people in the middle east somewhere
This is why contracting after service is so popular among these kinds of guys. You do the same imperialism like in the military but make way more money.