I thought this was going to be a complaint about how Netflix limits the rate at which they ship discs to 'power users' - folks who get more than a certain number (I think 10-12) discs per month. I definitely noticed a shipping speed decline once I revealed myself to the Powers That Be as someone who rapidly watched and returned dvds (I'm watching a couple of tv series, and I've got the time to watch a disc per day and have it back in the mail the day after I get it). They've admitted that this is a common practice, since they lose money on customers like me.
Honestly, I probably wouldn't require so many discs to be sent if they'd just make the series I want to watch available via online streaming (Buffy, Angel, Deadwood, Rome).