Good points. I have as you say, scored, extra work by doing exactly that.
Look. Let's not take this out of context.
Here are examples of what I think the OP is refering to.
I have had customers literally follow my every move throught the entire job. This is after I have taken the time to show the customer what I will do, where the dish will go, how the cable will be routed, drill penetrations'(if applicable), etc. This is very annoying to have someone invite me into their home and them act as though I am about to film a slasher movie and they are the victims. I make sure one the first things i do is throw out what I call an "ice breaker". This is some exampole of commonality I may have with the customer. Do I see a set of golf clubs in the garage?. Yep Bingo, I am a golfer so there's the conversation piece. I look around the house and tell the customer I like the way it looks or think the house is desinged well. Or anything i can find that will put the custoemr at ease and think to themselves " hey , he's a nice guy".
Also. I think the OP was refering to customers who may buy a new tv and can't figure out how to hook it up, so they call the satellite company and complain. This generates a negative service call and it not only goes as a negative on the company's record but the tech's as well. Customers should not be calling the satellite company on issues regarding equipment the customer purchased that have ZERO to do with the satellite system
Another issue. If the customer decides to move a receiver from one room to another even after they have been advised not do so, then call the satellite company and demand a tech come out and fix the mess free of charge. You must remember if the satellite compnay does not charge the cutsomer for customer caused issues THE TECH does not get paid because his employer does not get paid. This issue will be an ongoing battle for the rest of DTH satellite's existence.
And then there is the customer who demands free repair of pet chewed cables. This one takes the cake and the candles. I would like to know what in Sam Hill gives the customer the notion that their negligence( allwoing their pet to chew thorugh cabling) is not their reposnsibilty?
Now some of you out there who are in my view "defnding your turf" may think we in the service business you think we dislike people and think customers are all a**holes. Not true. Most if us do this becuase we want a career that involves contact with the public. We enjoy interacting with people in their homes. We enjoy outdoor work and being out of the confines of an office cubicle.
So before some of you go assuming all this negative stuff, take a deep breath and think about how you'd make out in our world.