I've spent quite a lot on VN's, somewhere in the range of 10k USD in the past two years, almost entirely on the games themselves, some of which I have bought physical versions of, but nearly no merchandise. The good news for you being in Brazil at least is that Steam and JAST at least - I'm unsure about Denpasoft and MangaGamer - have regional pricing, so the pricing will be more appropriate for you. The bad news is that anything you want that is only available in Japan is going to feel a lot more expensive to you, so stuff like fan translations and reading in Japanese is going to be rough.
Also, not everyone is going to vibe with everything that is out for visual novels, and that's fine. I'd recommend going on vndb.org, creating an account, and looking up some stuff by tags to see what else you may like. You can even sort down by only those available in English for instance. There's 10 mainline Rance games for instance (10 is still being worked on), so there's quite a lot just in that series. We also have a recommendations forum if you wanted to ask for recommendations once you get a better feel for it, cause right now the recommendations based off just Rance and Katawa Shoujo would be immense.
Anyway, thanks for joining the community, and don't hesitate to ask if you have any questions or anything, I hope you enjoy your stay.