I had to cut a couple lists because they got greedy.
I usually group sites based on my own personal feelings.
I take my time to absorb all things about a LL: traffic, PR, other submitters, number of backlinks, how long my site will be listed, how I'm being linked too... etc.
But all that information is just too much to form some sort of rational decision. So I tend to just go at it intuitively, and then purposefully mix things up just to see what happens.
