That's for experienced bartenders to find new gigs. A lot service industry jobs have similar networks to help match a supply/demand mismatch. The parent commen

That's for experienced bartenders to find new gigs. A lot service industry jobs have similar networks to help match a supply/demand mismatch. The parent comment was asking why someone with a 'desk job', often making >$100/hr, would knock off work to go make a fraction of the hourly pay for significantly harder work.