Everyone has a hobby or activity they enjoy. I'm sure she has one too; something that she enjoys doing. Ask her how she'd feel if you asked her to drop it. The OP needs to let her know why it means to you what it does. From your original post, it doesn't sound like she knows. Tell her. Like many of us that have made gaming a lifelong pursuit, you can take the game away from the gamer, but you can't take the game out of him.
I'm on a permanent vacation to the soul. -Tash Sultana
A fair few people on here have criticised the original posters wife for being selfish - I however, think that that criticism is unfair. If she's asking for the collection to be got rid of, then she obviously doesn't understand its worth to you. If you are struggling to explain to her in words what it means to you then you should show her what it means to you - show her some of the collection, ask her to read at least a chapter or two and then see if she understands its worth to you.
Just make sure she doesn't crease the spines
Some people have a way with words, and other people...oh, uh, not have way. -Steve Martin