No more than a mall sells customers to the retailers it contains. (With the caveat that, with Apple, customers aren't allowed to shop at another mall.) The mall (app store) may let retailers advertise via kiosks and banners etc, but that's basically keyword advertising, not selling personal information.

Providing a marketplace like this might loosely be construed as "selling customers" but it is in a massively different class of less abusive behavior than how facebook sells customers.