5 vs 8 or 9 or more

I was just listening to what I consider to be a very cool New Zealand band. In this band there are about 9 members and on stage they rock, with a big sound and an amazing vocalist they really bring something special to the live music scene. Anyway, it got me thinking about what makes a great live show, does this band have more potential to give a bigger, better performance because they have greater numbers than other bands? What makes for a good performance?I remember watching Muse in concert, I had scored a ticket from my bro in law Jonny Schwass