That is frequently the reasoning, more than a few people fake trance just to get their jollies so a lot of people insist on cam. Others want it so they can see the results of what they're doing(more personally gratifying), and some just like seeing other people nekkid :) It also helps let you know that the person you're talking to is the sex they claim to be. Still, it isn't required at all.
Still, if there are any nubile young women out there with webcams that want to be hypnotized. Drop me a note ;)
MacGyver wrote:well, i have been told by some hypnotists that the webcam thing is so they can see if their subject is actually going into trance.