The copyright puzzles me if you’re using other comments made by readers, so I’m guessing you’re using only our posts and your original material in order to obtain a copyright that protects your intellectual property.

I think anyone who might have posted, then decided to make buttons/badges/t-shirts out of their own comment, will probably have ‘first dibs’ on any copyright. As I remember, you can’t copyright a slogan but you can copyright a book and im-bed the slogan(s.

All-in-all, with so many banners/books/buttons that have already flooded the place (and more to come), you’ll get your share, and good memories of how your idea resulted in revenue for something you built and ‘they came’.