I'm one of the reasonable, haven't drank the cool-aid, non-cultish fans of cryptozoology and Bigfoot in particular. And jkmkay has it spot on. But further, crypto fans for some reason fall into an almost religious mindset. They believe faithfully in Bigfoot (rather than scientifically) and those who are skeptics are seen as persecutors of their faith and therefore hated. This they simply will not admit to, and desperately try to cloak their believerism with shallow pseudoscience. I'd LOVE for Bigfoot to be real. But using simple common sense, there has to be incontrovertible proof that they exist. "Extraordinary claims require extraordinary proof" ~ (Marcello Truzzi or Sagan). Crypto fans typically respond laughably that there's no proof that Bigfoot doesn't exist, as if one can prove a negative - a logical fallacy - or even that the burden of proof lies with anyone other than themselves in the first place.

While these shows are fun and a good scare is always welcome. Promoting them as reality is just wrong. I'm sure that cryptozoologists will find an unknown insect, small mammal or maybe even a monkey. Like the reality ghost shows. They will always come up just short of the big ones. They'll make it seem like if they just had a little more time.
When Animal Planet, Discovery or The History Channel put on these types of shows it hurts their credibility. It's like wrestling on SYFY. What's it doing there?