As LeeParrish said, low volume market. Might be able to get them more inexpensively if camera manufacturers adopted non-proprietary connectors and button layouts so a smaller range of housing types would be necessary. Heck, in many cases you can't use the same housing for two different cameras from the same manufacturer.
This is one reason why I've stuck with the Top Dawg for a decade. I've had 6-7 different camcorders in that housing without a single modification. L&M has seen the wisdom with some of their newer housings for Sony HDV camcorders (they made the Top Dawg for Backscatter).
This is one reason why I've stuck with the Top Dawg for a decade. I've had 6-7 different camcorders in that housing without a single modification. L&M has seen the wisdom with some of their newer housings for Sony HDV camcorders (they made the Top Dawg for Backscatter).