That ought to be an easy sell to the wife, if you tell her how much they've appreciated over the years. I can't tell you how many books I've bought for $5-$10 dollars when they first came out, and which now sell for upwards of $100-$300 or more, every time you see them on the secondary market! That's a pretty good return on your investment, but of course, the hard part will be letting them go. They become more valuable to me as the years roll on, and it would be difficult to part with any of them.
I list my books on the computer in different categories (those focused on hunting turkeys; technical books; kids books; books not totally about turkey hunting but which contain some chapters on it; etc.). My hunting-only category lists 247 titles.
Then, there's the NWTF and State turkey stamp collection, artwork, and of course turkey calls. Some might say I'm a turkey hunting nut, but to those people, I can only say, "Thank you!"