Posted By:
sagard<<<If Sagard is right, and my guess was about 15, then an awful lot of $1000 cards could become $5000 cards, or vice versa, based on some very subjective criteria.>>>
You and I have about the same ideas. In a group of ten 8s, a couple may be questionable. Just like a nice group of ten sevens a couple are probably 8s on a day where the grader is happy.
The $5000 cards don't become $1000 cards though for obvious reasons. 
Soren