Why do people wait to pull out their money to pay when they know they hafta pay?

you know how many people have lost their credit cards and money just by pulling it out a few minutes before knowing the actual price. I think 80% of people do this, just a few take out money before paying. Of course I suggest that if the jobs annoys you that means its not suitable for you, cashiers need not only to receive money but to have patience and positive customer skills. You might be great with the cash register but not as a cashier, I think you lack the customer service part.