i think its 2 main reasons. poker is probably a bigger market world wide. every other american film/tv series often seem to have poker games in them. these are usually played by the hero's/anti hero's. its portrayed as a very masculine thing to do. successful, big men, with big cars, blonde birds with big tits hang off their arms, they are wonderful bar room brawlers, shoot guns etc. the game as a very macho image.
trading on the other hand, is not generally widely known, hence a smaller number of participants. no tv series or films show macho men sitting pressing buttons, starring at comp screens for several hours. also those that do know of trading, generally consider us to be parasites/scum bags etc.
bit hard to compete really. perception would seem to be everything.
having watched you video link, he seems very dull, hardly fits the image i describe above. id sooner cut my toe nails then have er drink with him. yawn