I've only read through the first page and the last few pages of this thread, so this may have already been said, but repeating it shouldn't hurt. If you are crafting items that are regularly selling for you, be it from people actually using the items or re-sellers, and are making a profit from it, then you are set. No need to worry about what a re-seller is bumping the price up to. You made your profit. What you want to watch for are people making the same item and selling them for less. Their items will sell before your items, which means no profit for you. If you want to undercut them, make sure you are still making a profit by not going lower than the base cost (cost of materials plus GTN fees) of them item.
