Maximum of $70,000 a year, if they work 40 hours a week. That's not bad, but it's definitely not great.
They have not designed security in to your event. They don't have contingencies. They don't know floor plans and vulnerabilities. They maybe haven't met each other before. They don't know the difference between you and a look-alike. They don't know what's routine and what's out of the ordinary. They're probably not deputized, meaning they don't necessarily integrate well with law-enforcement. You're probably liable for everything they do.
There are parts of this idea that make it awesome. There are parts of this idea that should scare the crap out of anyone who actually cares about security.