As an actor (for what it's worth), a program like this would be greatly appreciated. I prefer to supply my own costume, and last years included a silicone mask, stilts, and a stilt costume. Not to mention the time and effort I put into learning to walk on stilts.
I did it for multiple reasons.
I don't like sharing costumes, masks especially. I want to have something I can call my own. And quite frankly, it made me the star of the show. I stood out.
Actors will respect their own costume and take care of it more than if it was owned by the haunt.
I think it goes without saying they would have to meet certain attendance requirements.