Because its still actually shit as a simple currency. Check reddit story of guy who buys a burito and has to wait an hour for confirmations, ends up paying them fiat aswell just to get home.
Uh, 0-confirm transactions are just fine for small purchases. Vendors need to get on with the program.
Yep. 4-6 confirmations are what exchanges wait for when transferring millions of dollars. Who gives a shit when it's a $1 coffee?
Also, have there ever ACTUALLY been any successful double spends (by that I mean someone lost their money/product)? I hear that they're possible and all, but I've never heard of someone doing one.
Good point, imagine trying to do a double spend at a coffee shop? If mainstream adoption occurs and some idiot does manage to do it then it basically becomes fraud/theft.