Ya. Don't know for sure, but I read it on the internet some time back, so it has to be true!
Seriously though, I recall seeing a quote by the postmaster general saying something to the affect "You're not my customer. My customers are 4 or 5 bulk mailers." It was a few months back. I've slept since then, but think I have the gist of it. I remember being shocked, but not surprised by the statement.