Something I don't think I've ever seen figured out in a cryptozoology article: if X number of people in a position to see something (for example, boating on Loch Ness) have seen the local "cryptid," how many have not, and does the ratio matter? Granted, the number of reports made is the only firm number in such cases, but could a guess be made of how many people boat on Loch Ness, or live and travel on the shores with a view of the water? Surely pretty much all of them are aware there is something famous to look for.
It would take a lot of work (surveys, I guess) to even estimate what the ratio between "Reported" and "Saw Something but did Not Report" is, but it's still an interesting topic, and Loch Ness might be the easiest target for such research.
This has always troubled me with spectacular cryptid creatures. How many zillion birders do NOT report seeing Thunderbirds in the Ohio Valley, etc.