I hate to say it, but I'm pretty sure the LJ user database got scrubbed and copied here at some point. I remember deleting am account here (before the name change) 7 or 8 years ago. Lots of us from LJ that somehow ended up with accounts that we never made. Surely some of those 5k users fall in that category, and likely don't even know they have accounts?
I know I haven't been super active, the whole thing kind of took much of my enthusiasm away