Don't be ridiculous, If it was about revenue there would just be more toll booths.
Sure, they're common in Canada and the US but in some other countries they lead to years of civil disobedience, protests and eventual scrapping by newly elected governments : http://en.wikipedia.org/wiki/Skye_Bridge#Toll_controversy
Speed fines have the semi-respectibility claim of trying to reduce accidents/dangers on the road (with some validity).
Not that I support his claim, just refuting yours.