Ummmm. Could he be PD?
And no, he isn't as Spartan with his belongings. I homeschool, so we tend to have quite a few books. A couple times each year I'll go through the books and donate a pile to the library for their book sale. uN/OCPDh has a bookcase full of books from his first degree 30 years ago. He never reads the books and the kids and I don't want to read the books, but he insists on keeping them. He also keeps any and all electronics, no matter how out of date, doubles of pictures that we'll never look at, and free swag from conferences he goes to.