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Chevrolet Volt. Photo credit: General Motors Co.

Few cars have taken more flak from media critics in recent years than General Motors' (NYSE:GM) innovative green car, the Chevrolet Volt.

Of course, few of those critics are auto reviewers. Those reviewers, like most folks who try a Chevy Volt, tend to like the car. It's a great product, one of GM's best -- and believe it or not, GM's best are now as good as anybody's. It's comfortable, well made, and does what GM says it will.

I've talked to plenty of Volt owners, and every single one sings the car's praises. That's apparently typical: The Volt is tops among compact cars in J.D. Power's APEAL customer-satisfaction survey.

In fact, the Volt has delivered on every one of GM's major goals for it. Every goal, that is, except one: the sales goal.

And that's where the problems start.

Is the Volt really a big money-loser for GM?
Nobody disputes that the Volt hasn't met the ambitious sales goals announced for it in more optimistic days. It didn't come close to the company's target of 45,000 U.S. sales last year, and it isn't doing much better in 2013.

In fact, Tesla Motors' (NASDAQ:TSLA) expensive electric sedan, the Model S, appears to have outsold the Volt in the first quarter, at least in North America.

That's more ammo for partisan critics who contend that the Volt is a money-losing boondoggle that is somehow subsidized by taxpayers (never mind that -- officially speaking, at least -- GM paid off its bailout ages ago) and should be killed off.

What's holding up sales isn't the car, it's the price: With a list price of nearly $40,000, the Volt is expensive for a compact Chevy, even a high-tech one. The sticker shock turns off a lot of potential buyers before they can hear the case for the car.

But is it really a money-loser for GM?

Why the "GM loses X dollars for every Volt sold" argument is flawed
No automaker, including GM, will tell you how much it's making (or not making) on any specific vehicle line. Critics doing flawed back-of-the-envelope calculations have contended that GM must be losing tens of thousands of dollars on every Volt sold.

But retired GM product chief Bob Lutz, who drove the Volt's development, has argued persuasively that the Volt is probably priced appropriately to cover its incremental costs.

In other words, each Volt sold probably pays for itself in terms of the parts and labor that went into that particular car. It probably also contributes a little toward paying down the big investment ($750 million, give or take) that GM made upfront to develop the model.

That's how the car business works.

So the real question isn't "How much is GM losing on every Volt?" The real question is whether GM will sell enough Volts over time to pay back GM's upfront investment in the Volt's technology with a profit. (It almost certainly hasn't so far.)

That makes the suggestion that GM should kill the Volt right now kind of a dumb one. GM absolutely shouldn't kill the Volt.

At least not yet.

Every Volt sold probably reduces GM's loss
Even if Volt sales don't pick up, the program's numbers will look better and better as more GM models incorporate the technology that was developed for the Volt. GM already sells a Volt sibling in Europe, the Opel Ampera. And the Cadillac ELR, a luxury coupe that uses the Volt's technology, is set to make its debut early next year.

Any sales of those models represent additional payback on GM's initial investment in developing the Volt's technology. And as Lutz argues, the knowledge (and green cred) GM gains from the Volt program has a value in and of itself.

So whether the Volt program ultimately turns a profit or not, it's really not a financial boondoggle for GM (or for taxpayers). There's no good argument for killing the program now: Most of the money has been spent, and every additional sale narrows the loss.

But should there be another Volt?
Here's the thing: The Volt's technology is unique. To oversimplify a bit, it's an electric car with an onboard gas-powered generator -- an arrangement no other automaker uses. It's innovative and works well in practice, but it was expensive to develop.

But functionally, the Volt is a plug-in hybrid: You charge it up at home, and then you can drive a moderate distance (38 miles on the latest Volt, says GM) on the battery before the gas engine kicks in.

If you have a short commute, you might only buy gas a few times a year. But for longer drives, you'll need to fill up more often -- just as you would with the plug-in versions of Toyota's (NYSE:TM) Prius or Ford's (NYSE:F) Fusion hybrids.

And that raises this question: Should GM push forward with this unconventional technology?

The truth is, GM is already pushing forward. GM CEO Dan Akerson said this week that he expects the next Volt to be significantly less expensive (and to be profitable), which suggests that its development is already well under way.

But in terms of technology, is this really the right direction for GM to be going in? Does it really offer advantages over conventional plug-in hybrids that are worth its cost?

I don't know the answer to that question, at least not yet. But I'd like to hear GM address it.

Fool contributor John Rosevear owns shares of Ford and General Motors. Follow him on Twitter at @jrosevear. The Motley Fool recommends Ford, General Motors, and Tesla Motors and owns shares of Ford and Tesla Motors. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.