Downgraded?

In the near future, I will be sending in a bunch of PSA 8's in the old holders hoping for at least a half point up grade. I will, of course, be selective in choosing which ones I send in. Just the ones I feel are at the top of their grade, well centered, etc...
My question is, "is it possible to receive a downgrade?" After reading the thread about the Shell, and how subjective or inconsistant (take your choice of words) grading is, it would be my luck to send in an 8 and get back a 6!!!!
So, have any of you ever heard of or had this happen to you?
My question is, "is it possible to receive a downgrade?" After reading the thread about the Shell, and how subjective or inconsistant (take your choice of words) grading is, it would be my luck to send in an 8 and get back a 6!!!!
So, have any of you ever heard of or had this happen to you?

0
Comments
As far as if what your doing is a good idea? I only think you should do that if your 8 looks has a real shot at being a 9 because if you resubmit and it doesn't bump up, at least you would like the 8 to still stick but if your card is a borderline 8, then I wouldn't because then you risk of it coming back or 7 and we want to get bumped up, not down.