I found the article linked in the blog to be just as interesting:
why i got a job at mcdonald's
http://www.heiferman.com/mcd/
I could zone out and not waste any of my creative energy during the day and work on my own stuff when I got home.
Even in the socialist paradise of California where you'll get a whopping $8/hr that's about $50 after tax for a full day of mind-numbing, spirit crushing drudgery.
You won't get home and find your creative instinct has been kept safe the entire day and it's time to unleash it for 8 hours of coding - you'll be aching, burned and numb. It'll be time to put on the TV to watch something that's not too taxing and crack open a few cold ones.
tl;dr - service industry is grueling work, will sap your soul