Maybe you didn't know it, but about 55 cents of the price goes to the payment processor.
Allowing people to have a digital wallet would cut down on the payment to payment processors allowing creators to get a bigger share of the revenue.
First payment processor takes about 50 cents base price, followed by about 3% on top of that. After that itch usually gets 10% of the gross revenue and the rest is given to the creators.
I just checked and PayPal takes 49 cents and 3.49%. The 3.49% isn't bad but the 49 cents base price is what is killing revenues for cheap games.
Splitting the base cost of a transaction across multiple purchases would be great.