Man, a bottle of wine being worth over 10x a national-grade equipment is... well, honestly kinda on-brand for an isekai story
2.5m for a mythril shirt? Frodo was walking around with some ICE on him damn
5m for a unicorn rapier made from the horn an extremely rare creature seldom seen in the kingdom, captured only because they occasionally wander off of the frosty peaks they call home... still significantly less than the price of a unique wine heh
Mans changing from a vengeful edgelord to a harem protag is pretty typical, very shield-hero of him lol