...or when the fake charger you unknowingly received catches fire or ruins your phone?
* It requires a printer, which I'd rather not even have in the house given security concerns and/or planned obsolescence costs (ink carts)
* It requires keeping the original shipping box around for a month
* It requires waiting around for the shipping people to show up, because they can't be trusted to pick up a package left for them.
* It requires waiting days for the funds to reappear.
Going to the damn store, receipt in hand, is actually easier.
For the ink cartridge thing, I'd look into a cheap laser printer. I have a Brother duplex model that I paid $80 for new. The smaller packed-in toner cartridge lasted me more than a year, and I don't expect to need to replace the full-size cartridge for years.
That's happened to me. There's a reason I use FedEx anytime I have a choice :(