Unless you have the ability to change up the show at least once or twice a month or you are in a great tourist city I say forget the idea. We had a hunted house that tried it here a short time ago. They could not even keep the doors open one night a week after trying everything including going down to just a couple of actors each night. I have heard about other haunts around the country that have faired the same way. I think it may be financially more successful to advertise that the haunt is available all season for parties. Hook up with a DJ and a caterer and let them have choices of what they can have at the party. You could charge a good amount for that I would think!
Just my opinion,
1986-1997 (Mutilation Mansion,) 1998 (Screamers Haunted House,) 1999 (Evil Intention Haunted House,) 2000-2001 Concept Creator/Business Partner (Urban Legends Haunted House,) 2002 Floor Plan Designer and Consultant for a (Haunted Barn) Owners had city challenges & were never able to open, 2002 Floor Plan Designer/Construction (Fright Nights Haunted House) 2003-2012 Now retired Owner (Deadly Intentions Haunted Attraction)