At first we may think that Halloween is just for kids. Well it is but for both big kids (aka adults) and little tykes as well. Well, for many retailers on Main Street USA (and for chains and on-line retailers) it's also a Big Business. In the past decade, spending on Halloween (principally for decorations and costumes) has nearly doubled. Gone are the days of a "candy-only" holiday. If you're not on board, you may be losing out.