Can you afford your special interests?

We hear so much about autistic people and special interests and so many people have them and enjoy them, but we never hear about people who can't afford them, what do they do?

I can't afford mine, I love early medieval history and things associated with it, such as archeology, but I can't afford it, I could easily spend £3-400 on books every month, many of the books I'd like are out of print or in limited print runs and cost between £80 and £200, I've looked online and many are as expensive as ebooks as they are print editions, if they exist as ebooks at all. Many journals are expensive too and online resourses are too and many are really aimed at organisations such as universities rather than private people.

It's frustrating to have an interest that I find so consuming, but can't afford to follow or find others to even talk about it with, but then how many people know the Anglo-Saxon conversion period even existed, let alone know anything about it?