Sadly it's not what it used to be....
If I can spot a carney, I'll usually ask if they are with it. They say yes, even if they aren't working that spot, they get a discount, if not on the house. That's just professional courtesy.
On the other hand....a guy is a jag, I don't care if he owns every piece of iron on the lot (I usually am on the independent) he pays, and he pays the sucker price.
All I can say is that I've only had that happen once, the names will be omitted to protect the guilty, usually an owner is tickled to death that I'm giving any kind of consideration to his help-and I"m glad to do it.
Ya never know when you're going to be the one on the other side of things. So to me, with it means that you've eaten enough dirt, been talked down to enough, treated like crap enough times, and still do a job that 99 people out of a 100 could not do.
For one dollar I'll guess your weight, your height, or your sex.