I fly a GLEX.
I don't hear of, or see, a great shortage of pilots on this type currently.
If you're well connected, then yes, there's freelancing to be done. A lot of it is ex Russia and involves stupidly long FDP's and absolutely no standardisation at all.
For me, I can't be bothered killing myself for a few extra bucks. I'm happy with my lot - even if I could earn more.
It's all about quality of life for me.