If your including detailed stats, I would agree that one domain per thread is probably better. If you had detailed stats for 5 domains in one thread, you might loose some attention.
That being said, if its going in the $20 drop thread I dont see a reason to list individuals, a list with main stats maybe, (ie traffic, rev, dev, search results) but keeping it simple.
It really depends on where your posting imo. I would rather spend the time coming up with a nice post with every stat i could find for one domain than list xxx domains in one thread.
-Zh