@Windsagio I have two categories for JNC series I follow - the ones I buy, and the ones I keep as prepub only.
Bookworm, Apothecary Diaries and Dahlia in Bloom are examples of the former. These are series I really enjoyed and will definitely read again.
The latter category mostly includes manga includes those books I either won't read again, or simply didn't like enough to justify the purchase. My funds are also limited, unfortunately... .
As for buying the Japanese versions, well, I don't do that very often, just with a couple of series as shipping can be expensive. Right now, the only ones I'm actively buying are manga (My Happy Marriage's special editions and Shoukoku no Altair, both of which get like one book per year) and the Honzuki junior bunko.
My Happy Marriage is also a strange example in that I'm getting the English novels but the Japanese manga... perhaps it's because the setting, but that one just feels like I have to read it in Japanese ahaha.