User blog comment:Asperon Thorn/From the Crown of Thorn: Welcome to the Jungle/@comment-70.176.221.190-20110818013347

Was a little worried after the first few paragraphs you might actually not know the reason yourself, but you nailed it. You also seem to realize but don't directly say that your team experience gain is increased the same way as your gold, since your extra solo lane is getting full xp instead of sharing it, and you are leveling with jungle kills. If the enemy team is missing a jungler your team should be able to out level them.