There are likely a good few kite entrepreneurs, mfg and retail level, whose career kite earnings would top $1M.
A while back, someone was trying to pry into what a brand might be worth, and found it (they though at least) listed in the UK as a corporation valued at 250,000.
Because of trendiness and liability risk, extracting profits and keeping the Co small on paper is no doubt a vital strategy.
I am sure the major retail outlets were well into millions 8 years ago, and many are still around. They would not be if it didn't pay.
Maybe Hadlow and Lenten, career-wise.
Doubt a lot of others, unless they are riding gear they get a royalty on as in Best, Cabrinha.
I once sold a board I built for $300.