From what i've seen and read, frame set costs of a build are about 1/3 the cost of most bike builds.
If it makes you feel any better it's a good thing you're not a roadie, besides buying frames, they have to buy gears, which i'm sure can add up pretty quickly, then again they also have to buy all that freaking lycra to match
You are still coming out leaps and bounds ahead of the roadies