I know an artist that was in one of the recent grammy bands etc. However you want to call them. Basically, he admitted when he first joined the group, he was completely humbled to be a part of such a talented group. They traveled all over the world. He told us about a story when they played in Korea. Now, they actually played in North Korea to top it off. They were invited to play at a festival they have in North Korea and all they could do was play their music and sing. They were not allowed to witness or talk to the crowd before or after the show. The fact that they can state they played a Christian music in North Korea was one of the most humbling experiences he stated he had while being in this band.
He never made a ton of money like you stated as well John. The one's in the group that made anything money wise would be the front lead singer and composers of the music they produced. This group never recorded with their own band in the more recent years and it frustrated a couple of the members because it was no longer really authentic. It was the way it needed to be according to the lead singer and the label. I remember we were told on the last album that came out though, the band actually played their music which really put a big burden in one's heart.
When they left the group after 12 years, he told us he has another calling and he does not really want to be in the band anymore. That even being in the band and as humble as he generally is, he could see how the fame was getting to him even during some of the shows. It was a lot on his family as well. It was no longer really genuine music too which is really his passion.
Another friend of mine that is in Nashville with her husband that lived in Central Florida for the longest time is recording music again on a whole new level. She is now signed with a label that cannot change or touch the music they write. She even told me that so many times there were songs they have written that were tossed out stating oh that will never sell so it will not be on the album. It broke her heart.
Singing and writing music is a very emotional based talent...of course there are mechanics and discipline needed as well to be good at it.
What I personally see is that writers and singers get locked into "moods" for a period of time. And where an album needs a theme traditionally it can't be all contemplative or sad...it needs a blend of upbeat/celebrating, encouraging, and sad stuff together.
All of course in your unique style.
From full orchestra rich Skillet to Toby Mac or Mike's Chair or Need to Breath of Thousand Foot Crutch.
All these groups have a blend of all the genre of music on their albums...but only a few songs get to be released as singles. (The marker of success for a song)
Everyone wants to sell singles...but singles only pay the bills if re-released from the album. And if the whole album won't sell...the single usually won't either.
That's why the soul crushing discards and edits.
Also very often musicians aren't exactly the most theologically astute. If a particular song is promoting a particular theologically minor principle it will be automatically sent to the junk pile... even if it is a great song.... because it will pigeon hole the group and alienate massive amounts of potential music purchasers in a very low paying field of music.
I know that it isn't exactly right...but the economics are fairly sound... again musicians aren't usually astute businessmen either.
There's a lot of career choices that aren't so soul crushing that a person can put their feelings and heart into...but the public at large is usually the real problem. They are judgemental and unforgiving moreso than not... even though by definition they shouldn't be.