Eh, not so much. Two speakers, a 1200 watt amp, mini-mixer, a few cables and mics. With speaker and mic stands, you're still looking at less than a thousand.
Or are you talking about much larger concerts?
I was able to run that type of setup for my church's Easter egg hunt (announcements and background music)...but for what I want to do (and more frequently find myself doing), I need more...
Larger concerts and festivals, for instance, I've got a church festival on Labor Day weekend. Probably 8-10 bands on Saturday...seated audience of a couple hundred, but several hundred more walking around to the inflatables, food, games, etc.
Currently, I've built four main speakers, two monitor wedges, and am about to finish off my first two subs. I've got a 32 channel digital mixer, tubs full of cables, other gear, and it's nowhere near enough.
I've got to borrow the church's monitors (which I also built), wireless mics, in-ear monitors, etc.
To do events like this properly, I actually need 4 more subs, my own monitor rig, four more amps, 8-12 wireless mics, a full array of proper wired mics...and that doesn't get into lighting, video, etc.
I've got enough to properly run a basic indoor wedding reception for a couple hundred people.
Outdoors, I'm one step above Seoul's idea of a megaphone...and that's borrowing the church's gear. I can't freelance until I get my system set up right.