I would like to release a Mac app through the Mac App Store that is free.
However, I would like to add new functionality in a future software update that is enabled through an in-app purchase.
I reviewed the App Store Review Guidelines, and I did not see any prohibitions to this approach (initially free, later add new functionality enabled by an in-app purchase).
If anyone knows of any rules or policies that I missed that would prohibit this, I would appreciate a heads up on it.
Thanks!