Recently I called some contractors about coming out and troubleshooting some lights in a house to see what the rates were.
I called 6 contractors in the phone book with 1/2 page ads or larger. Here are the results.

Contractor 1: $49 to come out and determine the problem. If we do any work the $49 fee is waived.

Contractor 2: $24 service fee plus $49.50 every half hour for troubleshooting. So the 1st half hour would be $73.50 and each additional half hour would be $49.50

Contractor 3: Free to come out and determine the problem. Then we will give you a free estimate for the repairs.

Contractor 4: $120 per-hour plus parts.

Contractor 5: $60 per-hour

Contractor 6: $45 per-hour plus materials

As you can see the price varies alot. If I were a customer I would be quite confused as to why there is so much difference in the prices. As a customer I would expect prices to be more consistant from contractor to contractor.