Sometimes having anotehr one down the road can work for you as well. People travel the world to visting Orlando because it is stuffed with attractions and they can fill out an entire week with something different every day.
While haunts don't exactly work this way they do create a buzz and this creates excitement about visiting haunts. I some one goes to a haunt (say your competition) and has a good time then they are more likely to go to yours another night.
The hardcores will check them all out in some mad feeding frenzy.
Watching a really good movie doesn't make you not want to see another movie it makes you want to see more!!
This is one of the reasons I take to other haunters here - to build out the industry and make haunts and Halloween more popular.