sure it will never exactly even out.
but the thing is: not isolated situations even out, but all situations together
imo on the long run everybody runs on ev line. or i didnt get this ev thing right
if u get it in 82/18 in fornt for 200 BB, you'll run 36 BB above ev if u win and 164 below if u loose
do it 100 times (assuming that u really win exactly 82 times) and u run 82 times 36 above and 18 times 164 below EV, which will make u run exactly on the ev line as 36*82=18*164
u can change that example getting it in as 18/82 dog, u'll run 18 times 164 above and 82 times 36 below
correct me if i'm wrong, but i dont think that getting it in as fav/dog has to do smth. with the difference between ev line and actual results.