Because I want to spend my money wisely. Because I don't want to waste my time. Because I want good information.

Before you go to a doctor, you want to make sure that he is indeed a doctor -- holding an MD from an accredited institution. You want to make sure that he didn't get his "degree" from a mail-order place in Nigeria after watching three hours of video. Alas, there isn't a simple, standard certification for survival instruction, so it's hard for the prospective student to know who is qualified and who isn't.