Don't tip the man who goes above and beyond the job description to get you installed . I understand the stinking thinking, but what goes around comes around...Kudos for the man tipping the guy who did not try to charge him any custom fees for trenching...I have installed stuff in people's houses for a long long time...I don't feel like I deserve a tip on any one job I complete, but when you go above and beyond, it does feel nice to be appreciated...I work in Memphis, TN and the two poor states that border it. If a day goes by that a customer doesn't ask me for a cigarrette or a ride somewhere , I consider that my tip...A TIP means, to insure prompt service...not, I ain't paying crap because that's his job...Just depends on what part of the US you work in, if you work in the north, tips are a big part of your income, if you work in the south, you better bring cigarettes, cokes and candy for your customers...Continue with that thinking...That should get you very far in life....