A similar ad would show the pricing, comparing a PayPal, Bitcoin and Cash transaction:
Pay with PayPal, and we get $.13 credited to our account.
Pay with Bitcoin, and we get the entire $.50 credited to our personal Bitcoin Wallet.
Pay with Cash, and tomorrow we'll be able to purchase $.49 worth of supplies.
the whole 50 cents yes but they'd have to wait a 2 days for it to confirm unless they chose to add some transactions fees (even then it'd still take 30 mins at least ). and the day after that 50 cents may only be worth 45 cents
They can accept zero confirmation transaction. Not sure an attacker will bother trying a double spend for a glass of lemonade.
exactly. thats what makes it the perfect crime. come in, fake your 50cent spend. go off with your glass of e-lemonade any by the time the kids realise the double spend the lemondae and yourself are gone! muhahhahahaha