I would not hire like that for work that requries good skills. i.e. drywall, tiling, etc...
But for demo work I picked up some people. Offered it to some HS kids but got turned down so I drove to a place I see people hang out and got some there.
Never did it before but just said I need 3 people to do demo, I will provide lunch. I got 4 and did not mind as it was a big job. But had several others running from across the street. They were not happy at those that got in my truck.
Price depends on the area. Here in N.VA its $10 a hour. And yes HS kids turned down tearing shit up with no jail, free lunch, and $10 a hr. I even tried craigslist and most wanted $20-25 a hr. Sorry; but $20 a hour for demo work is to much.