Tip baited on EVERY order today.

I'm gonna be blunt here. I work in Des Moines, and was driving yesterday for a bit and did 6 total orders before I threw in the towel. Every order gave me a est of $9-$12. Did em all. Each order i got a $1 tip. Came out with $28 on the day. They weren't short trips either, I had 3 10+ minute drives and one 15 min drive. I'm not sure i can do this anymore, as I spent $20 in gas today. Net profit was $8.