This is a bit of a weird one.
There's an online store where you pay your $10 bucks and get...
something.
The thing is, you don't know what it is! (Until you receive it.)
They do guarantee that it will be worth at least $10, though.
Interesting concept...
It's called "The Something Store"... I just mention it as a weird online business, which is apparently making money... (It's been going for about 5 1/2 years now...)
http://www.somethingstore.com
Best wishes,
Dien