One thing that I find rather amusing is the notion that a bigfoot would be sooooo incredible. Granted, as time goes on, it seems more and more likely that if there was such an animal, we would know it, but there are still vast regions of wilderness in which a bigfoot might hide. Given that they would be well adapted to their environment, and assuming that such an animal would be much smarter than the average bear, it wouldn't be surprising that us humans would be at a great disadvantage in locating such an animal.
Unlike claims of ghosts or ET, a living bigfoot isn't really that hard to imagine. So there might be a smart ape that has managed to avoid absolute detection. Big deal. It would be of intense interest to science, but it isn't like proving the existence of life after death, or building a working warp drive system. Same goes for Nessie and the many claims of lake monsters. So maybe there is a rare species of lake creatures that is very difficult to detect. Again, big deal. That's not so hard to believe.
If we find hundreds or thousands of people who claim to have seen such beasts, why not allow a little room for "maybe"?