How long have you been haunting? Do you currently have a haunt and what kind of props etc do you have?
In a larger neighbourhood, you are likely to get more TOT's, obviously. and small haunts can be very effective if they are well thought out and presented.
With a larger haunt in a smaller neighbourhood, you would have to consider the additional work and expense involved in buying or making a lot more props so it didn't look too sparse, and don't forget all those props have to be stored somewhere in the "off season". Offset that against the (probable) lower number of visitors and ask yourself if it is worth it.
If you consider that it is...then go for it! I know most of us here would love more space for our haunts.
Just my two pennyworth..