Having become somewhat intimately involved in developing the specifications to which these PLBs must be certified, I can assure you that there's a lot more to it than first meets the eye and the costs of gaining the required approvals is HUGE and difficult enough technically that many companies have given up or had to go back to the drawing boards. It ain't plug and play. The consumer market, even with just two players at this time, is very, very competitive, so the prices are not artificially high and margins at all levels of distribution are low. The size of the market, relative to the cost of development and certification is very small. Everyone in the industry wishes they were more affordable because everyone realizes that price is one of the major impediments to more people buying one.