Auditioning for a band... what a nightmare in my mind.
Years ago, unbeknownst to me, a recent neighbor/buddy of mine and his old musician/band buddies decided that, because this
Marko guy had some assets and minimal skills that would help with the creation of a band, I'd be a candidate for bass player, rehearsal host and PA guy (also lyricist at the time), and we were brought together to meet/jam, and the process of manipulating me were executed.
Sooo somewhere in that process I passed an audition of sorts, and many years, much band drama, money and stress later, I'm a bass player in a covers band, same original buddy, fortunately different other guys.
As for auditioning others, I'm quite horrible at it as I'm a hopeless softie IRL (don't tell anybody), I like everybody, and someone else has to be wise one.
As for the PA argument.... as the PA guy in a band where we get $100 per man, I don't feel there's room to charge anything extra- I already have the gear and trailer, long-since paid for, everybody else brings some skills of value to the table that I'm not good at, so I'm comfortable with that.
But the bass player also brings a rig from which everyone benefits, and the PA is a whoooole 'nuther expense, and it's
NOT unreasonable for him/her to get some extra bit of a cut for the expense, maintenance and extra labor (which is more than what happens
at the gig) involved .
I'm not talking about band members investing in PA gear they don't own, btw... I wouldn't do that, either.
I've seen bands where members supply various pieces that they own and take with them if they part, which is also a legitimate formula.
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Edit to add a little tip for worthy players who want to be in a band without having to audition...
PA and/or good rehearsal space (especially with a nice drum kit) will get you ahead of the next guy.