With any band there is aways the inspirational figure in the band, who is usually the frontperson songwriter, and then there's the rest of the band members. These days, with so little money coming from sales and publishing, there's just not enough money to feed the drummer, bassist, guitarist, cowbell player, as well as the frontperson/songwriter.
So if you are a new act, you'll see a 'band' as just more mouths to feed. Why bother with a permanent band, just hire session players when you need to record or gig, if and when you need them. It's the brutal reality of the music business today.
Sad but true.