Really at this point Apple control over app store is anti-competitive (and Google over play store), having to rely on community outrage to get stuff like this turned is ridiculous.
They should create legislation to control access to all app stores to prevent this rent seeking - force app stores to treat all apps equally according to store defined guidelines (including store owners apps) - any submissions have to be reviewed in a reasonable amount of time and if declined must receive specific violations of the guidelines on which the denial is based. Also make the "no outside payment inside of apps" illegal.
Suddenly the value add of the store streamlined experience has to be justified vs. other payment options - and you'll see the fees drop significantly closer to market level (and it will still be profitable for store owners and they will still invest money in developing/maintaining it).
They should create legislation to control access to all app stores to prevent this rent seeking - force app stores to treat all apps equally according to store defined guidelines (including store owners apps) - any submissions have to be reviewed in a reasonable amount of time and if declined must receive specific violations of the guidelines on which the denial is based. Also make the "no outside payment inside of apps" illegal.
Suddenly the value add of the store streamlined experience has to be justified vs. other payment options - and you'll see the fees drop significantly closer to market level (and it will still be profitable for store owners and they will still invest money in developing/maintaining it).