I do agree that you probably don't want a race oriented road bike if your goal is to commute to work a few miles but if you enjoy the sport and know what you are getting into then go for it get as awesome a bike as you can afford. It's better than wasting it on some huge car. Bike value should be > car value ;p
Still, riding your carbon race bike to the office is akin to driving your Ferrari to the grocery store -- uncomfortable on rough roads, no storage space, and when you get there, where do you park?
This was a few years back, but I got mine for $1200. Granted, this was in the middle of a massive sale, but still. It's even got a carbon fiber fork (but aluminum frame).
Frankly, not being Lance Armstrong, I don't care about the last few percentage points of performance. All I care is how much I get for the buck I pay, and whether I get a decent bike or not. Keep the chain lubed and the tires rock-hard, and the thing flies on most roads.
As it is I'd feel like I'm paying a premium to put up with worse infrastructure.
https://janheine.wordpress.com/2014/01/01/tires-how-wide-is-...