The way the game is right now you basically get punished for playing harder levels. I mean is no secret that elven queen is worlds easier than elven king, your average elven queen game would last you an hour, maybe an hour and a half, and there is practically no way to lose. But if you play something like elven king, you’re playing for much longer, easily over 2 hours. With a much higher chance of losing and losing all those hours. And all this for the same amount of xp that elven queen would give you. If you wanted to get xp you just wouldn’t play anything other than elven queen which is why it’s the most popular in quick play. If you raised the xp you get from beating these levels players would have more of an incentive to play the harder levels.