> However, in the end most people just end up buying it from top 2-3 marketplaces anyway, not because its cheaper, but also because they can trust it, it arrives in 2 days, and you can easily return it if you don't want.

I've got enough complaints about the amazon customer and user experience that I'm not going to list them here, but returns are so easy.

I click the button, and then I don't need to print off a shipping label or even package the item back up, I just drop it off at the convenience store by my house, they scan a QR code on my phone, and take the bare item from me.