Phoenix is located in a desert. A desert of customer service and idiots who will pay any amount of money to ride in a blingmobile.
To this, I say: Ghettocab for the win.
The drivers and cars are not pretty. They might not be detailed and ideally clean, but you're going to be in a cab for about 10 minutes while you go somewhere. You're not on a date. You're not going to live in the car.
You're not that special. Take the ghettocab and save a few bucks.