If you're buying from the App Store, this is probably a terrible idea. Other software distributors (like Steam, for example) have been known to disable people's

If you're buying from the App Store, this is probably a terrible idea. Other software distributors (like Steam, for example) have been known to disable people's accounts when they do a chargeback. Chargebacks aren't just "I want my money back". They're meant to fight against fraud, and there's an implicit indication that you won't be doing business with that vendor any more because of this.