Vanilla is a product of Lussumo:
Documentation and Support.
But if she knew that she needed those musicians I do feel that she should have budgeted for it.
I'm not so sure that she needs them so much as she accepts that her touring band doesn't consist of them and knows that her fans love to be involved so she is offering fans a chance to get onstage, hang out with a band they like, party, and get some free merch. I can't the be the only one who thinks that as a fan (of music in general), that would be a fucking fantastic opportunity and a hell of a lot of fun. I just think she's offering folks a chance to be involved as fans not as hired help.
Now, if she threatened to cancel the shows without support from free musicians that's one thing, but she's not.
But a lot of us have also looked around at a room full of people being paid to work on a project that they have been an equal part of and wondered "wait, this isn't fair..."
ie:throwing around how cheap her shows are, they arent.
her $20 shows have always been easier for me to afford than the $100 Motley Crue shows I've been to.