One other thing i'd like to add :
in the <granddad mode> Good old days (tm) </granddad mode> as a gamer you had a few options based on your cash flow. This was largely enabled by the utter glut of stock over a huge number of stores - with a ton of these stores now wiped out in Aki.
So - you could :
1) hunt down CIB A class or sealed (relatively rare in Japan) versions of the games you wanted - these would still be relatively expensive back in the day but obviously scarcity and demand have driven up these prices
2) Go for CIB / Item missing but Boxed versions of the game that are B class or C Class - meaning you still get the boxed version but something is wrong. Little Ryo might have written his name across the back of the cart in magic marker, the instructions might be missing or torn, the corners of the box might be tattered. This has a huge impact on the price - still does today too of course, but not to the same extent.
3) buy the game unboxed - you still get the game and it's going to run fine, but you'd pay vastly less.
Here's the thing - back when I got here until around, oooh, say 2010 maybe ? The gap between 1 and 2, and then from 2 to 3 was pretty damned large. Hell, anyone familiar with Galaxy in Nakameguro will know their large "loose cart" set up along the back row of the store. The prices in there were always incredibly low for the loose carts and even some of the rarer games would pop in there at reasonable prices. We're talking 108 yen upwards.
One of the big changes that rarity is bringing is forcing even loose game prices up to silly prices. Whilst I get it for super rare games that 55k is "understandable" for a loose cart, it's meaning that even low tier collecting is becoming an expensive endeavor.
The very first gaming item I bought in Japan when I got here was a PC-Engine Core Grafx (still the sexiest piece of hardware ever!) and .... 94 loose games and 3 boxed. I spent around 25,000 total and got pretty much all the games I was initially interested in. That said stock was so absolutely abundant that I was head down in a box swimming through loose HuCards.
Through time I would end up buying loose carts to play whilst the boxed versions sat untouched. Looking back - I do find this -massively- sad and part of my decision to sell everything was that "if i'm not playing it, and i'm never likely now going to get time to play it (family, career, etc) then I should sell it on to someone who can".
The economics of collecting now are way beyond what i'd be prepared to pay and, alas, i'm going to have to settle with other means of playing the games. I'm sure as hell not paying the going rate for rares anymore and I actually wonder who does?