Here is the way I see it.  If it is overpriced, people won’t buy it.  I know a lot of Motorsports associations use Stop-Fyre extinguishers.  I bought some several years back.  I keep them in the shop and in my combine.  I have seen the mess that the chemical extinguishers do.  I heard a story about a guy not too far from me, that had a Stop-Fyre mounted to his skid steer.  He walked into his shop one morning and the skid steer was burnt up.  Come to find out, the skid steer developed a short and caught fire.  The heat from the fire melted the top of the Stop-Fyre off and put the fire out.  Nothing else in the shop was damaged.  I have heard of insurance companies paying to re-charge the Stop-Fyres because they saved the insurance company a bunch of money.  Water extinguishers work fine for certain fires, but I didn’t think water was supposed to work on electrical fires.