Printables are tons of fun.  Who doesn't love a good printable file?  For one, they make parties a cinch to decorate (and easy on the wallet).  My parties always look like I'm a pro, when really I just printed some crap and slapped some streamers on the wall to accompany it.  For two, you can use printables to teach stuff to little kids.  And since they love to mangle the things that you let them touch, it doesn't hurt so much when you remember you can print more.  Plus, printables are just plain fun to look at!