Is that because they would have to program every single tf2 weapon?

When trying to trade with Storebot, they don't seem to have any metal available. if I try to trade the equal amount with weapons, he says "You don't have enough coins! The items you requested are worth 99999999999". Is this just a problem with the bot? Is this just a well known problem that has...

https://steamcommunity.com/tradeoffer/new/?partner=1268819060&token=zuLQfiWt send me a trade offer!