My original bet was Hech returns at least 9 WAR over the next 3 seasons, prorated to full seasons (600 PA). That is fair for both sides.
You countered with he won't hit 3 WAR in 2016, with no prorating. Only a fool would take that bet.
If you want to limit the bet to 1 season, I'll bet you Hech will exceed 2.5 WAR in 2016, prorated to 600 PA. For $50.
Edit: WAR as calculated by Fangraphs.