CylonGlitch said: I wonder if I could "buy" one of the $0 apps and then have the $15 tied to my account? Click to expand...

Nope.By the way. You get a downloader to download the app, but then you get an additional DMG that is like downloading it from the publisher's website. It's not tied to Amazon's servers or anything fishy like that. Updates are done with Sparkle, which we've all been using for a decade now probably.