For places like this? Thousands. Impulse purchases like expensive hobby drones depend upon the customer picking up and holding the item, that's half the sale there. Bringing a card to the cashier means you probably still have to work to sell the item.
Just ask Staples who saw a major drop in sales of items when they swapped to the 'bring card to cashier' methods. They still do it, but a whole lot of consumer purchases ended when they made the change.
I suppose there must exist people have pockets deep enough to be able to consider a $900 item an “impulse purchase”.