There should be a penalty for crafting something of new value to the player. If someone is leveling a crafter from scratch and decides to synth 100 iron hammers (because all of the materials are readily available from an NPC) - the server doesn't need 100 iron hammers. The sale price should be negligible, as it is today. Sometimes, an activity like crafting should be a pure gil for experience trade, especially if crafting something no one needs.