Don't be fooled by the intriguing theme, because the more you read, the more your brain cells will dwindle.
The MC's trade skill allows him to sell stones, trees, and other items (not money) for points, which can then be converted into any item in the modern world. There's no need for him to be a trader, which would make him a target for those greedy for his unique goods.
Wouldn't it be nice if the MC used cheats for himself, considering the many trees and rocks that can be converted into unlimited points?
The author only forced the MC to do that for the sake of the plot with his waifu.