I see we're all equally angry and confused at the development of things, like 100 times less price by the untreated stone and talking about wholesale of something that's not sold in batches? Not to mention nothing was said about the loot from the skeleton or the glowstones, we didn't even get to see the end of the fight but I feel like the author does weird jumps and will show it next. . . regarding the stone sizes I hope it was some miss-translation because it made not much sense that 5L are worth more than 13L, on a side note, if the supposition is true and the previous ones were from monsters stronger than B given that the B monster he killed was supposed to drop medium, I guess strong B to A drop large, then what drops XL and how is it so worthless (5 stones of supposedly S rank monsters are worth 100G when a staff to kill S monsters is like 10k)
I know isekais are often simple disconnect your brain and see a let's play mangas, but this lack of cohesion and coherence is a bit insulting by the author.