NEW YORK ( TheStreet) -- Having followed BMW's i3 electric car project for two years, I finally got some time to examine the i3's interior in detail. The BMW i3 goes on sale in the U.S. in the first half of 2014.With so relatively few plug-in electric cars in the market, it's not a major exaggeration to say that in many cases they all compete against each other -- from those that cost under $30,000 to those that cost over $90,000. That, of course, never happens with "regular" gasoline/diesel cars. Let me explain: I have seen plenty of examples of people who, one or two years ago, bought a Nissan ( NSANY) LEAF or Chevrolet Volt, but previously only purchased much more expensive cars --$100,000 and up. Likewise, more recently I have seen plenty of examples of people paying $100,000 for a Tesla where they had never previously thought of buying a car that's over $30,000. The first implication of this phenomenon is that all the market-sizing estimates for electric cars are wrong. The market for electric cars is a lot larger than people think, even in the short run: People who can afford expensive cars buy cheap EVs; people who never thought about buying expensive cars before, now buy expensive EVs. This is why the Tesla ( TSLA) skeptics have been wrong at every turn. This also has implications for the electric car intramural. Unlike in the old-world gasoline/diesel market, where there are numerous choices for every automotive segment, the EV world has only a handful of cars broadly available across the geographies, i.e., outside California where there are a few more choices. Then you look at the sales statistics, you see that there are really only three significantly electrified cars -- those that run on electricity a vast majority of the time, or 100% of the time -- that have sold in meaningful quantities: Chevrolet Volt, Nissan LEAF and Tesla Model S. World-wide, Nissan has sold over 50,000, General Motors ( GM) approximately 50,000, and Tesla little over 15,000. All in all, sales of all plug-in cars in the U.S. grew from 18,000 in 2011 to 52,000 in 2012 to an estimated 100,000-125,000 for 2013. It is in this context that BMW is starting to deliver the i3 in the coming months.