Many customer will request that I come back for additional jobs at a later time, sometimes years later, I usually give a relative discount to previous customers depending on the size of the job. Also, large jobs involving multiple tasks like running phone line, moving dish, and surround system hookup etc.
2) JUST BEING SUPER NICE !!!!
I love what I do and like meeting new and interesting people. A nice working environment is key to my happiness and might save you a few buck too.