If you have a wider playing group you will have a wider audience. As one of "our" collective aims is to grow the game of Rugby then I see no reason to limit it to boys and men. Besides, for a lot of us, if you don't have the support of your partner it makes being a STH that much harder. Also, a family day at the Rugby means you are getting the children interested early on which can only be a good thing.
Win/Win innit.