>Aifread : Weekly Jumps Comics are a good example in this case. Japaneses throw WJCs away, but mostly western collectors (probably japanese too) collects Jumps even if as basis these books are only produced as an ephemeral item.
>LuxKiller65 : that's funny you talk about this because these days I'm prospecting to find OBIs for my japanese books. A few years ago I bought a Terasawas book called Gundragon. It was a time I wasen't concerned with OBIs, so I didn't know that book was released with it. One day I came across with a complete copy and since that day I'm hunting the OBIs for all the books I bought naked at that period. I did the same with an art book of Kurumada (Sora) and I had to pay 170$ to get the OBI.
Anyway, you also evoke glued-on-case OBIs : same for me
I discovered that particularity on this one :
https://vgmdb.net/album/36132
Also, some OBIs does have a corner-cut. For example, this one :
https://vgmdb.net/album/37495