The reason they like to pick that benchmark tis that it represents the point in time where minimum wage was at its highest in history, when adjusted for inflation. Minimum wage went to $1.60 per hour in 1968. Adjusting for inflation, that's $10.95 per hour today. However, when it was first enacted, in 1938, it was only 25 cents per hour. That's only $4.22 per hour, by today's standards!
I started working in 1983, at the age of 13, doing house cleaning and yard work for an old lady in my neighborhood. I made $3.50 per hour, and minimum wage at that time was $3.35/hr. Adjusting for inflation, that's $8.01 per hour today.
I wish they would just pick a decent number for minimum wage, right now, start off of there, and simply index it to inflation.
The $3.35/hr minimum wage started in 1981, and lasted through 1990, when it was boosted to $3.80. In today's dollars, that would be $8.78 and $6.11, respectively.
Another problem is that jobs that once paid above minimum wage have been reduced to minimum wage or, worse, waiter pay. For instance, in 1991, while still in college, I got a part time job in a department store. I made $6.50 per hour, and time and a half on Sundays. In 1992, they cut out the time and a half, but gave everyone a raise based on how much OT they worked in the past. In my case, it put me to $7.03.
In 1991, minimum wage went to $4.25. So, this job paid me about 53% over minimum wage. But, fast forward to just a few years ago...one of my friends got a second job, in the same company, doing the same thing, but by this time it was just paying minimum wage, which was $7.25 by that time.
Adjusting for inflation, my $6.50/hr would be $11.37. I forget what year it was my friend did that second job, but $7.25 has been in effect since 2009. So, at the most, it would be about $8.05 today.
Back in 1988-90, I worked part time at Denny's. I started off as a dishwasher making $5.25 per hour, but soon became a dishwasher trainer and then a host, making $6.00 per hour. As a waiter, I made $2.14 plus tips. $6/hr in 1990 would be like $10.94 today.
However, today, I have a friend who works at Ruby Tuesdays, and he says that it's common to just give the hosts waiter pay, which in Maryland is around $3.XX per hour. The waiters all have to cough up 3% of their sales for the night, which goes into "Tip Share", and that money gets disbursed to the hosts and bartender. Possibly busboys and dishwashers as well, can't remember for sure.