This complete idiot... he's selling the stuff so low without a per person limit that people are buyint it in bulk and re-selling it for major profit.
At least, what he's selling is a consumable but he's still a complete moron, not to mention him buying from a store and not a bulk sale store is another idiocy. Didnt even say how much the surivival matches were being sold for nor did the manga say how much he sold the matches for after the first day 5 copper special. For a manga which only had trading for 5 chapters so far this is very lazily done and poorly researched.