Alright, so I excessively tip with good service, and my rule with dominos is, if I get the pizza in less than 30 minutes i tip the driver 25%. I know it sounds weird, but I wouldn't wanna be delivering pizza all day, so I try and show some courtesy. Anyway. The dominos drivers in my area have started crossing out or zeroing out the tip line. I've never thought to ask them about it, but does anyone know why they might do that? And it's only 2 of the 5 drivers I see that do it. Doesn't make any sense to me.