Right, cause it's not like you can't get upwards to 50% experience bonus without doing anything. Do Hall of the Novice? Get a ring that gives you 30% exp to lvl. 30. Preordered Stormblood? Guess what? That's an earring that gives 50% exp gain till level fifty, so that's 80% right there. Part of an FC at rank 8? Then they're going to be popping that exp gain for 10% for twenty-four hours. Would you look at that? 90% exp gain? Like Niwashi said, rested bonuses are an additional 50%, so that's 140% exp gain to level 30. Oh no, you lost your ring buff? that's still 110% exp gain till fifty. And if you have the friendship circlet cause you got recruited by a friend, that's an additional 25% till level 25. Look at all that extra experience! And that's not taking into account food buffs, chain experience from kills and the like.
