I just received this response from Stevenson and Hunt:
"Hi Mike.. I certainly have never heard of this enquiry before!!! However, I have contacted Pilot Insurance and spoke with an underwriter there. The underwriter advised that at this time they do not have any exclusions in their policies pertaining to reptiles and snakes that would hinder your ability to obtain insurance. The insurance company would be interested though in the length of a python for instance if you were to obtain one. "
When I asked her it wasn't specifically about insuring the actual snakes, but whether raising them would cause insurance issues down the road. Sounds good so far.
One thing though, anyone who is raising them and has wired their own flexwatt, and assorted electrical setups, if a fire were to happen and an inspector came through you'd probably be screwed.