Can you buy a car with a creditcard in ten minutes? You'll probably get a call from your bank, and the paperwork will take longer than ten minutes anyway. Can you also count the money out and check every note isn't a fake in ten minutes?. They'll know who you are anyway since you have to prove many things before you can buy a car. And if in doubt, just wait for the confirmations. It's not a big deal.
People buy groceries far more often than they buy cars.