gacha have element of chance, but usually speaking, gacha especially in asian games tend to also be tied to some form of power and is not purely cosmetic.

ao its not just purely, i want this character/costume/weapon because it looks cool, but theyres stats attached to it.

western game loot boxes generally sit more often as coametic, so the desire to pay isnt as bad (but can still be bad) but of course this doesnt apply to all western games either. an example of gacha based power is ultimate teams for sports games, which its gacha has players stats tied to them for team building.

gacha and loot boxes are fundamentally the same, but connotatively, gacha usually implies power and lootbox implies cosmetics, but technically not incorrect to use it either way.

if you want a dumb comparison, gacha is seen like trading card games, where power of the card also has value.

lootbox is sorta like sports cards where its collective in nature and really is about rarity/how the card looks

theres also the chance that at least for TTYD, that was a players choice version of the game, which retailed for 20$ new. since its 2006, on the wake of the Wii

outside of the official service, there is actually one other feature that people forget exists, and would be relevent to the resell of the key.

updating by local user (no not the recently announced game sharing stuff, but the ability to update a game via just being near a device with the update)

edit: of course, this will only work if nintendo okays the transfer of the BASE game instalation as well. time will tell if its possible or not, as its a situation thats functionalyl hard to test.

its worse than comparing it to physical media that has all content on media, but better than display boxes that only has a digital code in it.

digital key carts are more replacing the latter (which is better) but there will definitely be a few devs who will opt out of physical media storage costs for the key card