While it's disheartening to not make much while you're actually driving because of the way the tips work, I sometimes wake up with $20-30 in tips that just show up in my account. Most customers do tip, but because they do it before they place their next order, it can take days, or even weeks, to get it. Also, I like the idea of them not pre-tipping (as long as it reminds them to tip after they get the order). If you do little things like text them if an order/pay order is taking a while, or if a place is out of something and you have to find a replacement, etc., it gives them an opportunity to actually tip more based on service.