When selling an item on the Gaijin Market, you can select the item, set the price, agree to the terms, and put it on the market. Because this process is so simple, it could potentially be automated with a bot that constantly undercuts other sellers by, for example, 0.01 GJN. These offers would appear below yours and could be bought before yours.
Why not add a second authentication step, such as a code from the mobile app, when putting an expensive item on the market? This could make it much harder to automate the selling of expensive items and help prevent bots from constantly undercutting human sellers.