Or better yet, go to a concert. Most artists could never live off CDs, but from $30 tickets they could.
I don't think it's reasonable to say "oh, if you want to make money with music, you should just spend 6 months of the year living in a van traveling the country".
Even an author, typically far more introverted than a musician, has to seriously consider hitting the road to do book signings and interviews for any hope of success.
Sell a soundboard recording of the show I went to for $25 on the spot as I leave. I went to the show so I now have an emotional connection to that particular performance. Will this get shared? Sure, but the majority of people downloading bootlegs own the artists' oeuvre anyway.