User blog comment:Pgrobban/You get a Double XP! And you get a Double XP! Everyone gets a Double XP!/@comment-24956068-20150513183212/@comment-25968376-20150513183616

I always felt the need to get to the highest level since I lagged behind in the previous 3 seasons, and realized it would be good to get that crystal-generating treasure when the new season starts. It's entirely possible to reach the maximum level without Double XPs but I don't have the patience to do that much running these days.

You will however need it for some achievements, but if you don't care about that, you won't be needing them :)