I wasn't arguing, I just hadn't really thought about it. I see a few at 400nl and they aren't the players I worry about and I see so few of them at 1000nl I'm just not sure what to make of them at that level. I can't imagine pre-flop tightness (of 4-5%) can be a very big leak, but I wonder if it's usually accompanied by post-flop leaks as you're suggesting...