That's definitely not the wisest solution. I understand that you're upset, but why don't you use that trip to see the Genius Bar and see if you can get a solution for your issue? Genius Bar reservations can be set up here: Genius Bar Reservation and Apple Support Options - Apple
Sometimes they accept walk-ins.
Well, it asks you for your passcode because you haven't created Touch ID and it needs to verify that you're the one purchasing the app! 🙂 Just go to Preferences>Touch ID and Passcode and enter in your fingerprint. Then enable 'iTunes and App Store' under that same menu and you'll only (hopefully) have to enter in your passcode once more, after which you can just hit your fingerprint. 😉
Question: What is a passcode?