Apple developer Michael Jurewitz took a detailed look at Mac App Store pricing in a 5-part series on his Jury.me blog. It's a through exploration of the dynamics of App Store pricing that touches upon revenue maximization, demand curves and the basic research each developer should be doing before they write any code.
You can read each segment on Jurewitz's Jury.me blog using the links below.
Understanding App Store Pricing - Part 1 In this first part of his series, Jurewitz looks at the Top Grossing apps versus their Top Paid counterparts and discovers that the Top Grossing list was 329%