Weird that the chapters are going to be named after the wife. Also, this dumbass didn't think the price beforehand?
Realistically, sure, but in terms of narrative flow it's better to have it in close proximity to the events where it matters. Michio has enough meandering inner thoughts as it is (though thankfully much reduced from the WN). Let him do the thoughts about the pricing when they're asking about the pricing. This isn't Spice and Wolf, where you might actually expect readers to track math and pricing over multiple chapters.
Like, people aren't even remembering that, while the original price Sherry got quoted was 3500 per mirror, she negotiated it down to 30,000 nars for 11 mirrors, or 2727 nars per mirror. Selling for 10,000 each is actually a 267% markup*.
*
@Amariithynar said 10,000 on 3500 base was a 286% markup. That's not quite accurate. It's 286% of the base cost, but only a 186% markup. If you sold the 3500 nars mirror for 3500 nars, that would be 0% markup, not 100%.
Even after acquiring the mirrors with the discount I still think he should've added 20% markup or something, that's still probably considerably lower than what it would have cost to transport them without cheats. Man's doing math with his 2nd brain instead of his actual brain lol.
The trip to Palmasque was never entirely detailed, but we do know it was 5 silver from Zabir to Palmasque, 2 silver to reach Zabir, 2 silver to Dohona, 2 silver to Dobur, and probably a few more cities that weren't detailed in the story, since it was taking quite a while to get all the jump points registered. I would not be surprised if it was 15 silver each way.
So that puts the total effective cost of each mirror at around 6500 nars (35 silver + 15 silver + 15 silver), assuming you only have a single person making the trip, who can only hold one mirror. That means selling for 10,000 nars is only about a 50% markup, and that has to cover the time and effort involved.
However for Michio, he's not paying those costs. The mana regeneration potion that Adventurers would have to drink (and pay for) to make up for the cost of travel is dealt with by the mana drain effect of his sword, at no cost other than the time it takes to find a monster to kill. He's also traveling with three people, which would have increased the travel costs of a normal adventurer, but allows him to bring back multiple mirrors. And of course he's making the trip in one or two hops, instead of the half dozen with breaks that a normal person would need, so it's not costing him nearly as much in time, either.
Adding an extra 20% to the price (taking the mirrors from 10,000 to 12,000 nars) would be a huge benefit for normal traders, since 10,000 is barely breaking even considering the time invested. For Michio, though, it's a nice, but not necessary, bonus. Michio's profits (7273 nars) are already twice that which a normal trader would be getting (3500 nars), not even counting the time spent.
So from Michio's perspective, raising the price further is a fairly small monetary gain, whereas the goodwill from the Duke (and probably more especially, Cassia) is worth a lot more. If they continue to deal with him, giving him opportunities like these mirrors, or the amber (which is itself another massive source of profit for him), he'll gain vastly more than the few piddly silvers raising the price would be worth.
Especially the chance for future elf waifu, even if he doesn't know it yet.
