I understand that pretty well.
I have a bunch of projects, but also I have a lot of job on accounting (I have to travel 2 and half hours to do that) and teaching. I play guitars, bass, drums and do the clean vocals on 2 of them - obviously I compose everything - and in a couple more I do basses, acoustic guitars and 2nd vocals, composing like 50% of the entire stuff; plus, I play live like 4-5 times per month, so I'm usually very busy and sometimes tired as hell.
The hard times come when it's time to record-mix-master the whole shit and the job keeps equally demanding. A doom/folk band is currently recording their first demo on my home since a couple of weeks, so I have no time to rest...but it's very satisfying to do this kind of work.
The "borkendales" who live so far away from each other and do a lot more everyday than me, are just incredible and I admire them for that (specially Mr V who releases music like a machine
)
When a band makes his living just for the music, it starts to make music just to keep earning money and it's no honest anymore. Coincidently, my favourite bands are/were the "studio-only" (or almost) kind like Arcturus, Ulver, Vintersorg, Borknagar, Solefald, Arckanum, etx... bands which don't release 1 album/live dvd per year and/or tour the whole time. I have nothing against that but I think those mostly studio bands are more honest with their music, I mean, their vision of music is -IMO- more artistic than some cash grabber bands who releases albums just cause they 'must' do it.