The Modern Way of Doing Business

I can’t understand why there are some big stores in the mall that still do the old way of issuing receipts to customers. Like this one big store that sells gadgets and pc supplies, I remember I have to wait from the long line of customers in the payment section because the cashier has to write the items and costs manually. I wonder why they do not use barcode scanner to make the payment faster considering they sell the latest tech gadgets. I understand that it is to save cost, but it is costing their client’s time. And in the long run if they lose their client it will also affect their revenue and they did not really save at all. Don’t you think it is already time for them to consider the modern way of doing business?