One reason could be because almost nobody makes minimum wage.

In 2017 just over 2% of workers made the minimum wage. When you only look at full time employees, it's less than 1%. When you include only people over 25 it's even less.

https://www.bls.gov/opub/reports/minimum-wage/2017/home.htm

It's interesting how few people know this. When you ask people to guess what percent of people make the minimum wage, you'll likely hear estimates that are 10x or 20x higher than they really are.