Of course there is an element of business, otherwise he wouldn't be able to make these videos in the first place if people didn't agree to be filmed. The difference here is that being on camera is a small price to pay than the price of bringing your own eyesight back, something these people cannot afford.
The ability to do these treatments doesn't come out of thin air.
I know i wouldn't, i would just feel like shit. Because it is shity.
I'd rather have him keep doing silly video and dedicate 10% of his revenues to non-profit, period, no filming, totally anonymously.
How is this any different to people being filmed on a game show where they can win millions of dollars if they answer questions correctly or complete challenges in a specific time on national television. Those shows generate revenue by people watching them in the hope that people win against all odds or revel in the fact that they missed out on national television.
The difference here, is that this guy is doing it on Youtube and has a much larger impact on individuals lives.
Is that really altruism ? It sounds more like a business deal to me.