What makes you think that being a musician isn't a year round job and a every minute of every day job? It is. Do you really think that they just sit on their duffs in between when any of us imagine they are working or news articles tell us so? Being a musician is a very tough job, and it does take everything out of a person - just like those of us with 9 to 5's. But the thing is - a rock star can't leave their desk and go home and watch "Friends" at the end of the day over dinner - they don't keep the same hours, nor can they ever leave their desks - they are their desks!
See, these people live in the most bizarre fishbowls you can imagine. Every where you go, people are looking. Every day, you are having to live off of your creative gifts and answer to record labels. And then, you tour for two years at a time! Whoo hoo! Hours of playing and singing your ass off - the energy that goes into working a crowd, the hours of hurry up and wait - the hours of endless travel between gigs.
Listen, I was part of a fishbowl for about 3 years with someone. And I couldn't even walk some dogs w/o getting harrassed and/or photographed while doing so. I've seen the creative process, the breakdowns, the meltdowns, the crying fits when the melody doesn't come. This is a job that doesn't end at 5 - and yes, these people deserve their quiet time.