What is remarkably consistent is that so many offer really bad evidence, be it blurry photos or video, print casts open to interpretation, droppings that may or may not be bear, audio that is inconclusive at best, etc...
And when that evidence is weighed and found wanting because we never see the actual money shot, we are told "Well I've got much better evidence, but since you've been so mean as to tell me this evidence is inconclusive, I won't show you the really good stuff."
We keep getting the same excuses from some of the same folks. While their stories could be true, they certainly give no reason to believe them.
In the end, I just file the stories as entertainment. I'll be pleasantly surprised if any of them actually pony up the "good" evidence, and even more pleasantly surprised if that evidence is actually better, much less definitive.