Darn you got me..
I never reply to these but I shan't offend the gods of clickbait.
I usually buy a ton of manga whenever I'm in Japan, I've been lucky enough to been able to visit a couple times over the past few years.
I tend to buy a mix of manga that I've already read online and some that just catch my eye. If I really like a series I'll try to get a sequential collection of its volumes, for example, I own One punch man 1 through 15.
Aside from that I very infrequently order from CDjapan, although only in bulks of 4 as that provides the most favourable shipping.
All in all, I think I've spent a couple hundred euros on manga as I own just shy of 100 volumes. It'd obviously have been a lot more expensive to order them all online, as most manga only cost between 300-500 yen in Japan and I provided my own shipping :^). I live in Western Europe hence the shipping price is far from negligible
As for what I do with them.. I try to read them. It vastly depends on the type of manga but I try to read them as reading practice, as well as for entertainment.
The initial reason I even started reading manga is because I was learning Japanese, I really liked the concept of kanji.. still do actually, and wanted some good reading practice material.
I slowly toiled away at learning all of the jōyō kanji and have succeeded in completing them, however, the slang and colloquialisms in a lot of manga continue to pose a challenge;
a welcome challenge though.
Manga has the great quality that a lot of different types of Japanese are used in it. Textbooks and news articles are mostly very formal and perhaps even stilted in comparison.
Lastly, I'd certainly be interested in what releases are coming up; although that might make me order more frequently from CDjapan.. and I'm not sure if that'd be a good thing for my wallet :^)))