I'm considering doing a gas station mystery shop. I am to check the water and air and see if they work. The guidelines state most stations do not charge more than 50 cents, and I won't be reimbursed for the cost. Where I live, many stations charge $1.50 for air/water. If I pay this amount to check the air/water, it will cut into the small amount of money the MSC will be paying me. Do you just suck it up and pay the money, or do you just make a quick, visual inspection and call it good?