Dave Messent, OmniGroup:
OmniKeyMaster is a simple app that finds App Store copies of Omni apps installed on your Mac, then generates equivalent licenses from our store – for free. This gives Mac App Store customers access to discounted pricing when upgrading from the Standard edition to Professional, or when upgrading from one major version to the next. Another benefit: since they don’t have to wait in an approval queue, our direct releases sometimes get earlier access to new features and bug fixes. OmniKeyMaster lets App Store customers access those builds, as well.
A very elegant solution to a problem that simply should not exist, yet does because of some inanity by Apple regarding upgrade pricing, license transfers, and all things required to get approval to sell in the Mac App Store. The App Store model is phenomenal on iOS, and great on the Mac for typical users. But for power users, the Mac App Store is awkward.