[councilscheme]

how many confirmations would this wait for before dispensing? i.e. how long does it take from me paying for the coffee before I get it?

[grey-area]

Only twenty minutes or so, so the coffee might be a bit lukewarm, but it's ok as you'll be living in the future!

Seriously though, this is a really cool fun hack, but I doubt it is meant to be actually useful, or that bitcoins will be ready for vending machines any time soon.

[Toucan]

I'm not sure if you're being serious or not, but the cost of double spending is vastly higher than the value of the coffee.

The risk of accepting on 0 confirmations is probably lower than that of accepting fake currency or the cost of processing a credit card.

[grey-area]

Just out of curiosity, how hard is it to create fake coins if a vendor is not checking for confirmations at all?