The table should take into account the cost for you to make the resource. Including Gil and other currencies cost and time cost.
Is a delicate balance between those who want to grossly overcharge and those who just want an honest profit (around 200% of whatever your cost).
Want to kill FF14? Pander to the over chargers. They will grossly over charge. And if that what is sold is the ingredient for something else, that something else will be even more grossly overcharge. Which in turn will make the original overcharger charge more. Until new players cannot afford to buy things without going to a RMT.