A nice curtain certainly adds a lot to give a professional theatrical appearance to any theatre. You're lucky that you already have one as they are quite expensive. I know as I just put in a new one for $10,000. I could have gotten away with half that, but I'm so picky about the perfect fabric, design and fullness, as well as historical accuracy.
A curtain motor will cost several thousand dollars as well, and then there is the electrician to pay to have wiring and switches run up to the booth and hooked up for both manual and automatic operation.
I have never paid more then a hundred dollars for a curtain motor, as I have acquired all of mine used from old closed theatres before they were torn down. Maybe there is an old theatre near you that you could acquire a curtain motor from.
I have several, but I keep them as back ups as they are getting harder and harder to find. I do have one that I would part with. The one I use runs on 110 volts, but I have a heavy duty one that came out of a large movie palace that runs on 220. I would sell it for $100, but I don't want to be involved in packing or shipping. It would have to be picked up here in Pennsylvania.