Board Thread:General Discussion/@comment-32625891-20171109222250/@comment-33458669-20171110120350

It's mostly because there is so much grinding to do. People don't want to grind.

And as Vividivris said, the prices becomes exponentially higher.

Phantom Forces has a lot of grinding too, but thats because people like looking at the guns (I don't know if this is true, but I really can't think of any other reason people grind to rank 100+ in the game), and the devs keep adding more weapons.