The fact there may be no nutritional justification for purchasing organic products is moot (and even the science is still out on this, as there are studies which support increased concentrations of vitamins and minerals in organic vs. conventionally produced food). There is far more to organic food, least of all not including issues of animal welfare, environmental sustainability, pesticide and antibiotic use, and the so-called "industrial" food system that authors like Michael Pollan have written about. This just scratches the surface.
I am honestly not a fan of the Penn & Teller shows. Their viewpoints are interesting but are frequently poorly researched, sensationalized, and presented as objective viewpoint when it is in fact *quite* subjective - and they frequently load the argument by representing whatever opposing viewpoint they have with the weakest, most feeble spokesperson.
If you don't want to purchase organic food, fine. If you do, that's fine as well (I do). I for one am a fan of local, organic food (many smaller farms are not certified organic because of the cost involved but are for all intents and purposes organic). But calling people "suckers" for choosing to make that purchase is a bit over the top and quite frankly, condescending (perhaps an attitude acquired by feeling that purchasers of organic food are somehow behaving superciliously through their purchases - it wouldn't be the first time it's happened in history). You are failing to recognize that there are perfectly legitimate reasons for supporting organic farming.
The bottom line is consumer choice and transparency. When I see the organic label I know that the product has been produced in compliance with certain standards. In contrast, much of what is in the supermarket is completely opaque to me, and I have no idea where (or what) it came from. Does it contain genetically modified or cloned organisms? Where was it produced and in what manner? Eating itself is an ethical act, and the organic standard helps consumers to make a decision when purchasing their food - voting with their dollar, if you will.