Dont want to get on your bad side Gary, but a few points here.
#1) Why would you base it on the single piece price ? GHI must be making more that the first qty break of 10 at say Digi-key for $46.50. Also, Digikey has a markup where you are getting direct so I would assume that you getting it for an even a lower cost that what DK is selling them for,
#2) For many large companies $300 is no big deal. For far many others it is. Many of us make things here and we can look at the dev kit and say ok, its't got the guts of the module +80, a power supply, several connectors and headers and a LCD. These extras cannot possibly jack the cost up another $219. Now I know many hear are fans of Newhaven LCD's why I dont know because all of their LCD's are expensive.
#3) a BBB has almost everything your kit offers except the LCD and 2 serial connections and costs a fraction of the price so to say "With the development board I am surprised that anyone would be shocked by the price, it's a development board with everything on it needed to evaluate something that cost $50 in single quantity" is not really a valid reason.
#4) There is a marketing scheme I have seen, and to me it makes sense. When a company makes a development kit they make the profits minimal. Why? Because the hope is to get someone to buy the kit, get hooked on it and cause them to buy more of what you really want to be selling, which is the modules. If the kit is to costly, less people will buy it and get hooked on buying the module itself for their own products.
This can be seen even beyond kits like when you buy a razor, they sell the razor with a few blades at a low cost to get you hooked on the razor, when there whole goal is to first get you hooked on it then keep buying replacement blades where they actually make the money from.
I dont say these things to dig at GHI or you. I want GHI to be successful at this! when I first heard that GHI was doing this I was so dam happy about it. But with the kit costing that much, I just dont see allot of people going for it, and thus never buying the module.