You can commute on anything that moves. I've even seen people commuting on skateboards and push scooters. Just get the right tool (or weapon, if you prefer) for the job. Commuting on a high-end race bike is like driving a Ferrari to work - you can do it, but its not very practical. Wear and tear costs go up the more expensive your ride, and that applies to cars as well as bikes. An ordinary road bike is a great option for commuting in most conditions.