I think the cost may be related to how hefty the electronics need to be. Once the battery and capacitors are run down and the engine starts, the capacitor will cause a near dead short across the alternator, possibly frying its windings or even the power cables. The electronics will need to manage extremely high currents.
This could be an excellent solution for this problem. A battery runs down as the chemical balance in the cells changes. Voltage drops and the ability of the chemicals to produce power greatly diminishes. The battery loses its ability to deliver enough power needed to operate a starter. If the battery is connected to a Cap, the chemicals may still have enough ability to slowly charge the capacitor, storing enough power to run the starter once it's charged up. It likely won't have full voltage, but there may be enough quick amperage available to do the trick. They'll likely be making a nice profit at that price.
I agree that this product sounds like a good idea, but I am a bit startled at the suggested price of around $1000. That seems a bit expensive for a bank of capacitors and some electronics, but I'll admit that I don't know how much capacitors this size cost.
I learned something I never knew about the issues delivery truck drivers face when writing this story, and think this sounds like a good way to get around the problem in a fairly cost effective and user-friendly manner. Maxwell's supercapacitor can replace a normal truck battery and prevent issues with starting the vehicle even if the battery isn't charged. I'd love to hear from anyone out there with real-world perspective about this if they agree.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.