That is interesting, japanese gba you really like the box art and the way the boxes look I'd assume. cause out of all them japanese consoles I'd argue even in japan it's pretty pricy boxed for quite some games even the rpg's it's not that far off if not higher priced than western versions for allot of stuff. it's quite pricy in comparison to most other of the popular retro consoles that cost a fraction in comparison. japan really loves them handhelds it seems.
Not really. CiB Emerald is like what? 600USD+? (I actually stopped tracking that one cause its gotten too out of hand). My JP copy was ¥8000. Still expensive yes, as it's about the same price of a new Switch game. But much more reasonable for a retro game with such high demand (imo at least). Sapphire and Ruby I bought for about 5000 each CiB, and Fire Red/Leaf Green for about the same (a bit more actually but I forgot wat exactly). All those games are in the $300-$400 range.
Outside of Pokemon I can give other examples. Like Castlevania Aria of Sorrow, which is about a $200 game, but I found a copy for ¥8800 this weekend. The Fire Emblem Games are about $150, but I bought mine for closer to ¥6000. Golden Sun is about a $100 game, but here you can get them for ¥3000-4000. The Super Matio Advance games were all ¥3000 or less CiB. Sure they are not that expensive for NA copies (like $40-$50 maybe?), but still that's some good savings over all the games. Anyways, I think you get the point lol
Another reason I collect JP is because there are a lot of games I like that are JP exclusives that I want in my collection, A good 20% of the games in my collection are probably exclusive to the JP side of the GBA (Ace Attorney trilogy, Fire Emblem Binding Blade, Rhythm Heaven, Mother 3, Legendary Starfy series and so on).
I guess the main reason is just convenience though. I've been living in Japan for almost 5 years now. And whenever I go to a game store that sells retro games I would always see these super cheap (compared to their NA counterparts) GBA games. I was collecting GBA for 5 or 6 years before coming to Japan and prices for some games were just too high for me personally, and it has only gotten worse (especially from like 2018 onwards). The fact I just see all these sweet games in stores makes it more fun to "hunt" for them too. I feel like finding CiB GBA in Canada was super rare. Almost all NA GBA games I had to buy online, which takes a lot of the fun out of it for me.