Contract SWE gigs on the US west coast. I have a guy at $175, a full stack dev who does fantastic work, but he's booked out a year in advance and it's like pulling teeth to get him to accept more than 5-10 hours a week.

"Can I pay you a higher rate to take on project Z?"

"Nah man I'm as busy as I want to be. Maybe next year."

I'm sure he does the work in half the time stated, which is fine by me.