User blog comment:MacCCx/WHERE IS EVERYONE IN RAID BATTLES??????/@comment-30054866-20170617055117

To be honest, Raid Battle is only used for a few reasons at this point; mostly because most players who use Raid are those who have been playing for a long time at this point. People use Raid when:

1). They want RC6 spheres; or

2). A new raid was opened.

You could also argue that people do it whenever the Brave Medal Raid events are on, but it's an event that no one really notices at this point.