I was reading an interesting recap Gizmodo did of US government gadget purchases from June 2001 until today and one number stuck out at me. They collected their information from the federal procurement database and found that of all the government gadgets RIM easily took the cake at a $117 million cost including the expenses of using the BlackBerry (BES service, servers, etc).
While other devices/gadgets may not have been around as long as the BlackBerry the next in line is the Apple iPod at $10.8 million. This should give you a basic idea of why RIM caters to the high security and mission critical market.
Let us know what you think of the other data!