Now, if the number of people you interact with is so high that the cost of emailing them is significant, and you get enough work to fill your time either way, t

Now, if the number of people you interact with is so high that the cost of emailing them is significant, and you get enough work to fill your time either way, then you might want indeed want the group B approach. (However, this seems rather unlikely, and in any case the time spent emailing is probably a small fraction of the time spent on work.) Cf. "Why "Nigerian Scammers" Say They're From Nigeria", https://news.ycombinator.com/item?id=4136016 https://news.ycombinator.com/item?id=4136016