I'd think a more "fair" comparison would be "percent of dollars spent". Since Apple is purposely targeting a higher cost, lower volume segment of the market.
It's a fairly difficult comparison to make though because you have to compare a single companies vertical integration to the non-integrated supply chains of several other companies.
Also, the consumer experience of a single well-maintained, and mostly safe App Store plays a large role in why iPhone users are comfortable spending more money on third party apps.
Anytime the discussion around Apple’s take on subscription revenue comes up there are always comments from people that they wouldn’t even mind paying a premium price just to have the convenience of having all their subscriptions managed in one place, and free of company-specific dark patterns for unsubscribing.
It's a fairly difficult comparison to make though because you have to compare a single companies vertical integration to the non-integrated supply chains of several other companies.