My husband currently feels I have an 'unhealthy' addition to the Outlander franchise. I say it's a healthy one as my addition is only to buying books. It could be far worse. This topic of course only came up as I mentioned wanting to start buying the books containing the Lord John Series as well as the other novellas ("Virgins", "A Leaf on the Wind of All Hallows", and "The Space Between").
Personally I don't see wanting to own the books as a bad thing. I just like the series and enjoy reading them. And, generally speaking, one of the books will cost me a fraction of what he spends on 1 video game. And just as video games are his entertainment and offers him a world to get lost in, the same is true for books.