i already have usb sticks. and i don't want my usb stick to be on my keychain. i prefer to keep it in my wallet. moreover, dropbox is a good option for me. that's why i wouldn't buy your product.
i already have a usb.
not special enough
i already have a usb stick and i always keep it in my wallet, so there is no need. but it's a good idea for businesses.
too many usb sticks on the market.
i already have that many usb sticks...
got one already
not a new idea, there are plenty of other portable sticks, i wouldn't pay more than absolutely necessary (no extra money just for design).