This is something I've suddenly been asking myself.
I'm playing all classes without help of each other. Since I also don't like using consumables, I made the following decision: everyone gets a vocation with their respective armor being the main thing (Metalsmith and Explorer), except for Light Armor wearers who go for jewels (Tinker).
Of course from the start I already noticed it: the recipes are absolutely terrible. In the end, I pretty much only wear the +...vit jewels (+5 vit rings and +7 vit earrings, critted), and a +60 evade rating critted necklace only because necklaces are quite rare to get at first, and usually another reward is more wanted when a necklace is offered (perhaps the other craftable +... morale necklace would be better in theory, but it gives such little morale, I will never reap the benefits of that, while evade does at least something, as small as it is).
This is only the first 15 levels, perhaps it gets better, but when I look at tier 2 recipes, I just don't see how their critted benefit could back their weakness up.
So, is there any point in being a Jeweller? Wouldn't being a Tailor and making Light Armor be better? Or will things get better later on?