Why is Maple so popular?

I play because I think it's fun. The skills are fun to use, and the game is so simple. When you level, you add points into two stats. You chose a job and a subjob, and besides that you have no stat bonuses or skills. Not to mention the 2D art style allows for much better looking art in-game, while in 3D games they have to lower the quality or it won't run well.