#3 above, schedule - is definitely the clincher for standard scareactors.
If you can get a stationary/speaking/dedicated role, they can be a little more lenient with schedule. In 2003 I played a captain on Ship of Screams along with two other guys, not really a scaring position but more spieling, and was able to just work Sunday-Thursday nights. Out of the three of us we were able to work a schedule where we all had plenty of days off but there were always two of us on site.