Hello everyone!
I was wondering if anyone could clarify some things some things for someone inexperienced to crafting and the game in general 
Am I correct in thinking that …
1) All crafting careers provide an equal amount of experience points. Leveling a jeweler, artificer or cook will all give you the same experience.
2) The average number of levels gained from leveling a crafting (say, from 0 to 400) is ~12 or 13 levels?
3) The experience gained from crafting is constant. A level 2 going from 0 to 400 will acquire 12 levels much like a level 20 going from 0 to 400 will acquire 12 levels.
I would be much obliged for your help!
Have a good one!