Generally liked & agreed w your post, Shuswap.
BUT - I think this claim thrown out there by the script writers employed by the BCSFA - and subsequently blindly parroted by industry defenders and promoters - including some at DFO - is quite misleading - as it was intended to be.
More samples absolutely DO NOT cause an increase in reported infection rates.
More samples may be required to accurately find a low prevalence rate in the wild population. Less samples (e.g. in the upper watershed above Hope) might mean they did not take enough to fins a low prevalence rate in the samples above Hope - not the other way around.
Ya - I'd like to see the BCSFA try to publish that in a scientific journal, GLG....