Turjan said:
I can understand the reasoning behind the elven cook reaching 17th level. But would this not result in the situation that the average elven commoner should be around 10th level?
Well, first is the issue of whether you believe that every character in the world has unlimited potential -- which, as I've said, I don't. Could every classical composer rival Beethoven if he just tried hard enough?
Second is the question of how devoted the elf in question is to his task. Does the elf farmer strive every day to improve his technique, to approach farming in new ways? If so, then yes, I'd say after a few centuries he should be pretty good at it. If he says "It's a field, I've got a hoe, what I did yesterday worked just fine, I'm going to do it again today" -- I'd be happy saying he sits at his current level. Most likely, the bulk of the low-level population are people who have reached a level where they can perform their daily work and are no longer trying to advance.
In the case of this chef, I'm saying that a) she has an amazing innate talent; and b) she has spent centuries honing that talent and challenging herself.
Turjan said:
Another question: Should she not be an expert? This would somehow circumvent this commoner problem altogether.
Why? It would give her three times as many skills, better attack bonuses, better saving throws, and better weapon and armor proficiencies. Odd martial arts movies aside, why does a chef need any of these? She needs one thing to be an expert in her field: Profession (cook), and Profession is a class skill for commoners. That leaves her with half her skill points -- not counting any bonus points from intelligence - to spread between other Profession or Craft skills, other Commoner Skills, Knowledge skills if she decides to pick up the Education feat along the way (and she has six feats to do so), and cross-class skills.
Certainly, you can make the perfect innkeeper, who has Knowledge (local), Sense Motive, Diplomacy, etc in addition to his Profession skills. But a commoner doesn't have to be a farmer: they are simply people who have no combat training and have focused on a few skills. Craft and Profession are all most common-folk need to do their jobs... and commoners get them both.
With all that said, I completely agree with you -- it's really best just not to think about it!
Turjan said:
Let's see when our 17th level commoner reaches epic levels

. Ah, an epic commoner - that would be something

!
Hmm... Now I'm seeing a campaign where the players are told "You are going to be this world's greatest heroes. You are the last hope against the forces of darkness. Use a 32-point build, and 30 levels... all of commoner."
"Taste my
flaming barbeque fork of basting, spawn of evil!"