I agree with this totally and forms part of the point I'm trying to make.
A dyno is a diagnosic tool used to determine how well the car is running, and to make it run better. The figure at the end means little. Where the figure has meaning is when I go to a workshop and put out 150rwkw, then after a few mods and retune I get 190rwkw. This tells me that the car has more power, the money spent wasnt a waste, and it should be a lot quicker. Again, however, this 190rwkw figure is almost certainly going to be different on a different dyno.
For people who just want XXXrwkw etc, find a dyno that reads high. It will cost $30 for a power run and you can say that you have XXXrwkw. Just dont be surprized when a car with a lower power reading is able to keep up you.