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No guilt whatsoever. We all should have things we love and love to do.
I figure that if I can cook even one amazing meal out of a cookbook, it is usually cheaper than going out for a fancy dinner. I also like to justify my cookbook collection by thinking that whether the books are cooked from or not I enjoy reading them. Most collections are never actually "used" if you think about it. Stamp collections will never be used to send mail and coin collections will never be used to purchase anything.