a) The income coming from touring, streaming and selling records/merch is independent from the number of members in a band;
b) It's hard for artists to make a living through music;
It seems to me that there is an economic incentive to have the lowest possible number of members in a band, so that each member earns more money.
Is this is a thing? It seems logical to me, but never heard anyone talking about it. If not a thing, why?