They do have quite reasonably sized fangs, certainly much larger than Boiga. However, Macropisthodon have much much larger fangs. Which is why I rate Macropisthodon as a very dangerous genus and I have already consulted on one very severe bite by M. rudis that resulted in paralysis and bleeding.
As for why the locals don't get many severe bites, this is due to a couple reason. Cerrtainly they are much less likely to get a prolonged bite, as opposed to a keeper that is feeding. Second, a funny thing about coagulopathy is that you feel fine... until you get the shocking hospital laboratory tests back. So, unless they seek medical care they may not know that their blood chemistry has been hit for six. Only way they'd know is in an extremely severe bite where they are bleeding out of their bum.
Cheers
B
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Dr. Bryan Grieg Fry
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Australian Venom Research Unit,
University of Melbourne
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Population and Evolutionary Genetics Unit,
Museum Victoria
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http://www.venomdoc.com