I think they are worth their price many times. I mean, I've seen the Toyota GT-One for less than 3 millions, and we're talking about a car that´s superior to, for example, the almost 5 million Audi R10.
And for those who start the always annoying "this camera is better than this other one" war: camera choice is a matter of preferrance, for each individual, the best camera is that with which he/she is more comfortable or fast, and it doesn't matter if it's the roof cam, the chase cam, or whatever. So please don't start saying "x" camera sucks and is horrible to play with, because that'´s your opinion, and may not be what someone else thinks.