How big is the band? I saw a band recently in a 600 capacity venue. It was probably 70-80% full. Near the end the singer said the tour was losing money so plea

How big is the band? I saw a band recently in a 600 capacity venue. It was probably 70-80% full. Near the end the singer said the tour was losing money so please buy something. Of the metal bands I usually see, I assume the majority have other jobs.