2000 hours / 3hr small jobs = 660 very happy customers who aren't going to be calling anyone else the next time they need work... when (guess what) the rates have gone up.
Do you really think you are going to get all those call backs next time just because you are cheap. People call the same contractor for a variety of reasons and price is only one of them.
Some it's scheduling
Some it's how clean the job site is.
Some it's the quality of your equipment
Some judge by how friendy the service tech is.
Some want a tech in uniform.
Some even believe that if you don't charge enough that you couldn't possibly know what you are doing.
Some believe that if you are cheap there must be someone cheaper.
Every service call is a sales call and the thing that you are really selling ( no matter the product) is yourself. If you can sell them on you then you get call backs and if not they look for another contractor. It easier to please people if you charge enough to do the job right and it surprises many to learn that those wanting the lowest rates are some of the hardest to please. It's much easier to please a customer that's just looking for good quality work, clean job site and a friendly tech.