What do you estimate is the going rate for senior Clojure tooling developers in China or India with comparable productivity and credibility as Figwheel's author?
Just to be clear, I don't think he deserves less than that when working.
I'm saying that I think he'd be probably happy to be paid half of it and continue his project. Similarly, seen from the donour point of view, there will probably be many that think: "I earn 30% of that per hour, why should I donate for such egregious salaries?"
Now, to answer your question:
I have no idea, the way you phrase it, it certainly sounds as if consulting salaries are the same?!
If so, I believe you but I believe the percentage of companies willing to pay 150 per hour for a local is much higher in Western Europe and US than in the BRICs or Eastern Europe.
However, I feel 150$/h is quite a bit for something that was done for free previously.
Taking the 3 months of figwheel, we're talking no less than 60 days * 1.2k/d = 72k$.
It's probably just a (slightly above?) average consulting salary in the US/Western Europe but everywhere else that's really a lot. Heck, even some friends of mine working as developers in Germany or France don't earn that in a year, even after adjusting for taxes and social security.
Being a (Clojure) consultant myself, I know the mathematics and I charge the same order of magnitude but I don't go around telling people this because I feel that might have negative consequences. (Most of my friends don't read HN, hence the contradiction in the last sentence)