For recruiters who contact me from companies that aren’t my usual area of career interest, I do this to see what the upper bound is. It once backfired on me. Shortly after finishing grad school, a recruiter contacted me about a quantitative finance position and asked what range I was looking for. I replied “about $350k”. He responded, “We can work with that.” I think I had to scrape my jaw off the floor. I didn’t go any further with the process because the job seemed to require extensive travel and 80+ hour work weeks (and who knows if I could have even passed their rigorous interview process), but his reply was quite the revelation for someone who had never been in the workforce.
If a company has to pay you that much over typical market rate (for software devs), there's a reason.
If they hire you you'll then be faced with the feeling that you're out of your depth, overpaid, and incapable of doing the job you took, but that's a different set of problems.