Earlier quoted context omitted.
I'm happier to pay Valve's 30% than Apple's. With Valve you could always switch to Itch or something if you didn't want to pay, but with Apple you have no alternative. Valve gives you access to a huge player base and lots of useful marketing tools and such.
Ok! Happier is a fine place to be. They are both still too high. Not everything has to be binary -- I can think Valve is offering some utility and also think that Valve is charging too much for that utility. The fact that Gabe has a billion dollars worth of yachts probably suggests that maybe, just maaaaaybe, that 30% could be lower and Steam could still provide you the same level of marketing support and player base…
You don't get to decide that. Apple's price is not set by free market competition, Valve's is.