Why do I want a large, community sized bat house?

We all know bats in North America eat tons of flying insects every night so that is an obvious benefit to having a bat house.  However, large bat houses provide an additional benefit- wildlife viewing.  Watching the bats leave the house at sunset is an unforgettable experience.  Thousands of bats pour out of our bat houses every evening.  Providing one of the most spectacular wildlife spectacles on earth.  Many large bat house sites attract visitors every evening from miles around and from all walks of life.