This leaves me wondering what percentage of a typical service industry worker's salary is usually spent on tipping, and whether it couldn't be the case that if

This leaves me wondering what percentage of a typical service industry worker's salary is usually spent on tipping, and whether it couldn't be the case that if they stopped giving and taking tips entirely they would be better off in aggregate. I guess it depends on what fraction of their income is spent on "tippable" expenses. I know that in my own case there was a period in grad school where it was only slightly below 50%, implying that almost 10% of my wages were spent on tips... what exactly are the "best" tip percentages that service industry people leave like?