First off: No its not. I spent for 40 Ranks at max 100.000 Gil due Botches, but thats about it. Everything else and that includes all other Crafts is just farming Mats, turning them into Ingredients, Final Product -> NPC/Sell. If people simply dont understand that you can Rank up a Craft to 50, without spending much Gil, they didnt understand it. ( Was the same in FFXI btw ).
Rings are a Skillup Item. If you try to sell these via Bazaar you will sit on them for a long Time and you will slow down your crafting progress. Just vendor them, but only do if you farmed the Mats yourself.. even if its just a couple thousand Gil per Ring, in the end its pure profit over the Ranks you are making them.
Goldsmith can craft a lot of different things btw. not only Rings. So you need to get away from that way of thinking.
Tell me the Craft which will Upgrade Weapons then i.e.
Banneret Lance,
Jade Hora? Who will craft the Arrowheads? Who will craft the Gems, which are needed in Weapons? Who will craft the Ingredients for the NM Weapons as in
Aeolian Scimitar? etc etc Goldsmith is needed for a lot, you never realized that?
To be honest, that comment was just bs.
... *facepalm*.. No offense, but you need to understand that there is really more than just Rings. I dont think you realized that while you was sp'ing it.