Hm... I'm not sure how it compares to the experience of a musician, but my husband ran a very successful kickstarter campaign and I feel lucky to have watched him over his shoulder. Despite raising a significant sum of money we barely broke even, mostly because of shipping costs overseas. Also, factoring in the hours required to package/ship/reship damaged books and actively update/interact with the audience rather than working on more books... the project was essentially a vanity project that didn't yield a profit. Maybe he could've ran the project better (I doubt it), but I'm not sure if one can live off of crowd-funding alone.
Also, just because you're published by a big publisher doesn't mean you don't get face-to-face time with readers. When I was doing graphic novels I felt like I was constantly speaking to people -- teens, librarians, moms. Word of mouth, to this day, is still the biggest and best marketing tool for even the biggest publishers. Then again, the book world is a little different than the music world, I guess? I don't really know.
Having said all this I look forward to starting a kickstarter campaign for Rema someday. HA.