The "Mystery" Upgrade isn't such a mystery after just a few purchases, plus the boosts are just too pathetically weak to match the corresponding costs, despite the fact that you get one (ONLY ONE) talent point per purchase.
There comes a point in this game where you could, theoretically, make your burger "fly" forever. However, I ended up getting bored after earning over $30K. Turns out my burger ended up flying for 29 minutes and 59 seconds, covering a distance of 276,707m!