I like this idea. And the reasons against it are just people trying to protect their profits. If it was a skill that someone could specialize in then that would be one thing. But it just requires paying someone else who is willing to take the risk to spend money on upgrading your item for you. Why is this allows? What you are paying them for can't be added to the trade window. This is effectively trading plat for gold. And if you can't add it to the trade window is against the TOS. And STS should not allow this. Or at the very least give others the same opportunity to profit from crafting/upgrades.