What a load off ---Cleveland steamer--- !  
 
 
 I buy a more expensive membership and I get ( so i can have more movies out at a time) the slowest service ! 
If i can find another place with decent service I'm done !
What this probably refers to is the number you turn over, not the amount you have out at once.
For example, I was on the 3-at-a-time plan, and I turned over six discs a week.  Or I would have, IF they would get my stuff to me on a timely fashion.
I didn't blame them for this problem, rather the USPS.  And of course it's not really their problem either.
I resorted to reporting the discs 'lost' when I dropped them in the mail so they would ship the next one the same day I dropped it in the mail.  Unfortunately that only lasted so long.  After a while my account was locked, and I had to call and find why.  It was because I had reported so many as out.  The guy unlocked it immediately as every single disc was accounted for, but I couldn't do it again, or risk getting locked again (and having to deal with a PITA phone call each time).
Eventually I cancelled my account, not because I didn't like the service, but it was a monthly expense I could do without.