On the surface this thread is "should we make a +EV move if its +EV?" and uh, yeah, yeah you should. But on a deeper level its about our abilities to estimate our EV, and being cognizant of the fact that we're often very optimistic in our calls.

In a gray area where its hard to calculate your EV, should you attempt to do it anyway? Yes, of course you should. And should you act on that estimation? Its hard to go too wrong doing so. Just, again, be cognizant that your estimations are likely to be optimistic and fight that urge to think you're in a more favorable situation than you really are.