I agree, I enjoy watching these types of shows as well. I find I do learn a bit too, both from the successes and failures that are shown. However, like anything, you have to do a little critical thinking and assess the ideas and skills presented and understand how they apply to your own skill set and the situations you are likely to face. Some shows are better than others, but I think there are always things to learn from (even the much maligned Bear Grylls who I've recently started watching and am genuinely enjoying).