on cars with stock(ish) alignment it helps to keep from rolling the edges over too much, and therefor more traction, also because it stiffens the tire you get better response
the flip-side is that what you really want is enough camber and tire pressure(not too much though, too high of a tire pressure can reduce surface area/grip) so that the whole of the tire is evenly heated, this can best be tested with something like a infrared thermometer
the most hassle free way to figure out what tire pressure you should run is to chalk along the sidewall, you should shoot so the tire wears out the chalk right up to the wear line( seperating the tread from the sidewall, all tires should have one)
i havnt watched the episode yet, but going from "this made me suicidal" to "it was a bit boring" is a improvement
!!
i think they should send all the presenters who aren't journalists to a journalism school, so they can be better at writing and therefor presenting