I know this poll is from aggggges ago...but a book?! *drools* That is an AMAZING idea!! Would it be 'random' stuff, or professinal serious photos of everyone? Or a mix? Good luck with whatever you do! ^^
All I can say is if it's worth the money. I would greatly love to support your efforts, but I'm very frugal with my money and it would only really happen if this book was made of epic win. The pictures would all have to awesome and the highest quality you can manage. Costumes, backgrounds, camera angles, use of light and shadow- and it'd have to be made up of mostly pictures we haven't already seen. Having a little info about how the whole process came together would be nice, too. It'd have to be filled with the creativity and energy that we love about you ladies. Perhaps I'm going a bit overboard, but you did ask what it would take for me to buy a cosplay book, and that's what it would take. I wish you the best of luck.