The 4C is a "purist's" sports car. The Datsun 240Z and Lotus are as well. Other than the Lotus, I don't know of any other "new" cars that are "pure" (no frills, no creature comforts).
The 4C is coupe, as is the Lotus, Cayman, Boxter and a few others. Most, including the BRZ have a jump seat and are NOT a true coupe even though they are advertised as a coupe.
Now, lets compare fuel consumption.
The 4C claims 40 MPG. Few cars can make that claim. Geo Metro. Toyota Prius... Not what I would call fun cars.
Porsche, Jag, Corvette... 30 MPG or less.
Fun cars. There are plenty that that would make fun daily driver and most would probably be a better choice when stuck in stop-and-go traffic for an hour. But that doesn't mean I want one of those.
Race car for the track. The clubs and groups that do true "racing" in my area require a full 6-point roll cage as well as other safety equipment installed into the car. The 4C might be difficult to modify in this sense. All "race-cars" become difficult to get in and out of. The numbers and such attract the attention of police, as if certain cars don't get enough attention.
So, what does a person want, and what compromises are they willing to make?
I'm getting a 4C as a daily driver, primarily. I will track it, but not in "race" class. I already have a dedicated 240Z for that.