I once saw a job posting for a Web Developer/Python position where the client stated: "$1,000/mo is enough in Belarus."
I stopped to think for a bit: "I hardly made $800/mo when I was freelancing, and I was happiest when I was not working."
I think the biggest argument for Basic Income is to normalize what is already an existing systemic exploitation of a broken system. Professional exploiters and accidental/system-justifier exploiters need to be cut off, which might motivate professionals and invalids to assess our system as more just. I'm sure a positive network effect will follow.
Why not just try it? Why not stop arguing these speculative points and just try it?
It only works if you test.