Got my oil changed last week. At the end when passed the credit card machine, it asked if I wanted to give a 20%, 25%, or 30% tip. On an oil change, where the t

Got my oil changed last week. At the end when passed the credit card machine, it asked if I wanted to give a 20%, 25%, or 30% tip. On an oil change, where the technician is certainly making market wages and not some lower rate meant to be augmented by tips. The madness has to end and I think the only way is via regulation. The free market is exacerbating this downward spiral rather than correcting for the idiocy.