Just a note from the field ...
I had 3 pins in a brewery ...
DE guns and Roses (3 balls)
Radical (3 balls)
Wizard (5 balls)
All at $1 (New Zealand) a play.
The Wizard was usually the biggest earner.
So ... people will play them. If they are a good game, playing nice and fast, set up sweetly.
5 balls (rather than 3) is a good value proposition for some people.
(I do appreciate that NZ is a different market to the USA)
rd