If it costs $1,000,000 to design a car and I sell that car for $30,000 and I sell 33 cars, I've lost $10k. But just selling one more car will turn a profit.
On the other hand if that car costs $32,000 to make and I'm selling it for $30,000... GM has long been in the business, for whatever reason, of selling cars below cost [1]. And for the Volt, it's more like selling a $40k car that actually costs $80k to manufacture [2], not even taking engineering and marketing costs as a factor.
Selling more Bolts and Volts would hurt GM, not help.
[1] https://www.hotcars.com/gm-admits-bolt-not-profitable/
[2] https://www.forbes.com/sites/michelinemaynard/2012/09/10/stu...
It looks like engineering is included as "Development" in the original report: https://www.reuters.com/article/us-generalmotors-volt/factbo...
And there's the rub. People say they want these things, but when it comes time to open the pocketbook, their calculations change. Worst thing is that the people who can afford this stuff will instead drop more money on an ICE SUV.
:(