That's a good point. Also, in paying at the beginning, he doesn't sit when I pay, just stands while he runs the credit card. And at the end, he stands up, opens the door, and the shakes my hand/says goodbye. In the past, I'd pay at the end, he'd sit during that, then stay seated because he'd have to send my invoice and might have been doing other stuff on the computer (like looking at emails). So he didn't want to sit down, then stand up, then sit down again. So this avoids him doing that. Though a couple times, he's forgotten that I paid at the beginning, sat down, then been like "Oh right, and stood back up again (when he could have just stayed sitting).