AVB, I agree 100% over customers not wanting to pay the labour to do the job. The don't see that you have to cover the cost of the tools and shop electricity etc.
Yet they'll take their car to a dealer at $120/hr but can't afford to pay for their mower or ATV to be fixed. Around here, if the customer has a Mercedes of any age, they are usually the hardest ones to get money from!
I find I have to quote on the job first as they get really upset over it all.