In order for developers to have the pro versions of their apps, they must side-load it. And, it is typically a debug (non-public release) build.
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Well, I guess it at least saved me 30% of the app cost if I wanted to buy from myself.
NOTE: This only applies to when using Google's in-app billing system. I don't think third-parties care as much about who is giving them money.
~ Danial Goodwin ~