Yeah, +EV doesn't seem so cut and dry with sports betting. Typical sports betting seems more like opinion. And if you are good at it you can make a profit. The test is a number of years as someone like Redietz seems to have done.

That said, it seems like some of the things that Mike (Wizard) does with sports betting might be more along the lines and qualify as +EV. He is basing it on mathematics of past events, rather than evaluating teams and personell. That seems more about math and +EV. (To me)