Sure, it certainly could be difficult. But this is often because of information assymetry — the purveyors are making big claims about the dragon in their garage. [1]
If your intuition told you that there ought to be some evidence for grand claims, you would be right to be suspicious of the continuing absence of suitable evidence.
If your intuition told you that there ought to be some evidence for grand claims, you would be right to be suspicious of the continuing absence of suitable evidence.
[1] _ http://people.whitman.edu/~herbrawt/classes/110/Sagan.pdf