Reasons I spend more times in DM chains:
-It is not searchable, by search engines or even using site tools
-If you desire, you can still go back through the history (more than 50 one-line messages re: sneedchat)
-It doesn't gamify your posting or reactions
-Rules are created and enforced by community interactions
-Notifications for unread DMs are more reliable amd visible than notifications for watched threads
-Some people feel emboldened enough to PL even while being told to stop. This is good content and I'm not sorry for enjoying it.
-It can be simultaneously user focused and topic focused, with no strictly enforced penalties for blurring these lines
-The above creates conflict fueled drama at times, which can be as enjoyable as any public lolcow
-Initiating new people into the culture, seeing their perspective on it, and their subsequent conflict and/or formation of an identity is rewarding and good content.
-Inviting people to get new eyes allows for you to break through insular community involvement, in a way that is more intuitive and welcome than @ing a bunch of random people in a public thread. I'm so sorry some people don't enjoy it but how difficult is it to leave the chat? Can leaving be made even more braindead simple for these people somehow?
-I don't go looking for random threads to participate in because a lot of those boards are filled with low effort posts that aren't as enjoyable as DM posts.
I'd be happy with a "leave and block inviter" option, but I doubt what I want or think matters.
On the topic of wishlists I'd love a way to invite every user who has not blocked DM invites, but that sounds even less realistic.