I'd agree that there are no direct analogies, for sure. Especially physical goods.

    Like Best Buy doesn't get a cut if I pay netflix to 
    watch it on the TV I bought from them. 

Okay, but if you were launching a rival to Netflix and had many millions of dollars to play with, wouldn't you gladly consider a deal like that with Best Buy?

Imagine Best Buy's extremely large presence in the world of television-selling. You could get your streaming service into a lot of homes if they promoted the heck out of TVs featuring your service in exchange for a cut, right?

Depending on the % cut they wanted, that could be a great deal for you. Suppose the % cut was 0.0000001%. Certainly you would take that offer. And probably 0.0001%. Maybe even up to 10%. Maybe even 50%, depending on your business model?

Anyway, I have lots of problems with the App Store, but man... that 30% sounds pretty fine. Access to that many users, many of whom have payment information stored a mere tap away?

If BestBuy made a deal to get their customers to sign up for Netflix then yes. You are BestBuy's customer and Netflix is getting access to you.

If you sign up for a Target card, they get an initial cut and then monthly percentage based on your usage. A bank is managing that card not Target.