...i've probably interviewed over 100 undergrads and grads for trading program positions in recent years, and there are some seriously smart kids out there. so keep on deluding yourself that you'll be running a book, making millions someday, because in all probability, you'll never get the opportunity. the guys which get the offers are almost always the ones who have done there research properly, which you clearly haven't....
Arb, that is my (indirect) experience as well. I have four phd friends, one in Algebraic K-Theory, one on Harmonic Analysis, the other a Computer Scientist, and the other a particle physicist. Two of the four turned _DOWN_ quant jobs at _MAJOR_ firms. The other went to work for them as a programmer, then got bored and went to work elsewhere, and the CS went to work for a private futures fund, then quit, then made a fortune trading options for himself.
These guys are sharp as a tack, but in my experience, only the "leftovers" from the real talent go to wall street. The real talent is working with Ed Witten, or Andrew Wiles, etc, in the field of their Phd.
IMHO, the ones that are MBA's are, well, the "engineer" types.
nitro