I spend most of my time solo. Part of the reason is that my level, quest or intent dosen't match anyone around. Also my current mmo's combat is to active for me to chat well fighting. If I can't chat, I don't see any big befit to grouping. I tend to play next other players more then I group with them, every now and then I find myself next to another player and we do things together, but we don't always group. Though I do tend to get a ton of group invites form people I don't know. That feels creepy.