I'm doing it every game whether if I win or lose but always been curious if my xp went up or didn't get anything at all. You can actually do this in League(it's where I got the habit of doing it) and have no downsides at all to cancel animation of the victory/defeat screen and go back to the main menu easily. I might be the only one doing this but Id just like to know if someone found the answer I'm looking for.