Dannyalcatraz said:
So...within the same book you have Collegiate Wizard- a Feat that doubles known spells per level- and another- Extra Spell that lets you "add a (single) spell" your PC couldn't normally learn to his spell list...
That just strengthens my opinion that Extra Spell is intended to be read expansively and not restricted as per the FAQ clarification.
While not all feats are created equal, nor are all feats intended to be used by all PCs, this is a fairly radical difference in power & utility.
Collegiate Wizard gives practically zero power and utility that gold alone could not give. The only real advantage is time and potentially spell selection (DM dependent).
Nearly the same benefit can be had by finding a Wizard's spellbook and some treasure.
This is not a powerful feat. A useful feat, sure. But, not powerful.
A Wizard could buy specific spells from other Wizards at 50 GP per level (PHB page 179).
At 1st level, this is 150 GP for spell purchase and 300 GP for putting spells into a spell book. Equivalent to a few potions which could easily be used up while low level adventuring.
And, at the cost of a feat.
At 20th level, this is at most 9,950 GP for spell purchase and 19,900 GP for putting spells into a spell book (although many Wizards would try to have a Boccob's book by 10th level, so that would save about 12,640 GP). It would cost him at most 29,850 GP (or 17,210 GP with a Boccob's at 10th). That might sound like a lot, but at 20th level, that's 29,850 / 760,000. That's < 4% of his total wealth. Hardly a drop in the bucket.
Your opinion here does not follow RAW, nor is it very logical.
An overall 4% savings in gold (or ~2.25% for most PC Wizards who gain a Boccob's Book) is not as earthshaking as you are making it out to be.
And, at the cost of a feat.
The only real advantage of Collegiate Wizard is that the Wizard gets to explicitly pick and choose which additional spells he wants whereas without this feat, the DM has a lot more control.
Finally, comparing feats and using one to state functionality of another is not valid. That's like saying that one spell works like another because it does not say that it does not.