Those stories are indeed mostly behind me.. Still no tips, but I'm not bothered. We're truly not the cheapest option, and for some of our customers, it is a financial stretch to use us; but they do, and that in itself tells me we're doing the job very well. A big part of what enables us to do so comes from not needing to rush (push for volume) to make a profit.
A friend opened a garage and thought being the cheapest in town would get him a lot of business. All it brought in was losers who knew their cars were ready for the scrap heap. All he heard was do it cheaper, gimme a break.
He raised his rates and the losers went away. His new customers have newer cars. They want them fixed right and are willing to pay for that service. He's doing well now.