The low per hour wage is based on the assumption that employees receive gratuities, and is an incentive for the employee to provide exceptional service
I've noticed the quality of service decrease with each new generation (for lack of a better term) of young people. "Millenials" in general are the worst, especially about interrupting conversations. Every time a server in a restaurant interrupts me or my wife, the amount of the tip goes down. I'm not even factoring in (yet) the tendency to hint for us to vacate by leaving the check before we've finished eating. This has become the rule rather than the exception.
I rarely if ever fail to tip, but the amount is directly related to the quality of service. It's not my fault these people don't get good tips. It's theirs.