I agree with your post but have to take a bit of exception. Sure anecdotes are evidence. Just not very good evidence. First there are limits to our ability to fully understand and comprehend reality (see
Epistemology). Second, people want to believe all kinds of different things and tend to see the evidence that confirms what they believe. So we have anecdotes of alien anal probes and anecdotes of psychics and anecdotes of seeing Bigfoot and leprechauns. Finally, the brain is a very falible device. It's amazing in what it can do but on average most people aren't that good at discerning truth of many things. Add ego and self serving and you've got a recipe for disaster.
To paraphrase Aaron Ra, if I saw a full sized living velociraptor walking down my street I'd believe that anecdote. But if after a few days there was no further evidence of the animal I'd consider that I could have been deluded. Oddly enough people are deluded without even knowing it. Some people even believe that they know they are god because of parietal lobe seizures and until a doctor lets them in on the secret they don't know any better (see
temporal lobes of god).
There might be a god but we know far too much about how people fool themselves and/or the limits of our knowledge and brain pathology to rely on 3rd party anecdotes of anything extraordinary without evidence.
Somebody tells you they found Bigfoot and need investment money to share the secret with the world, do me a favor, get some evidence.