What would you consider as "fair" line distribution?

[spopo]

Mostly position/skills.  I feel like some people believe that a "fair" distribution is one where all members have equal time singing, and that's pretty ridiculous.  Positions exist for a reason.  Main vocalists focus on singing and maybe don't dance as hard.  Main dancers have fewer lines so they can dance harder without having to worry about tons of lines.  And a group member who's maybe less talented should maybe take a backseat until they can get their skills up, not get the same amount of lines as a trained singer just because it's "fair."

That being said, I do strongly believe that you aren't going to give your members any lines at all (which seems to be not uncommon practice) then they shouldn't be part of the group at all.