Board Thread:Question and Answer/@comment-73.32.52.182-20141101214056/@comment-25151790-20141101230442

Yep, that's right. And most of the time you'll be pulling the UR near the end.

The incentives of box summoning are that you know what you'll be getting and you'll definitely get the UR if you spend enough. Other summons could take more money to get a UR, and you may not even get the ones you want.