First off, maybe an intro is in order. My name is Ray...I was on the old board for a number of years, mostly as a lurker and b/s/t trawler, which will probably be the larger part of my role here on the new board as well...but anyway, after some time away, I'm back actively collecting.
As I've looked around for my first new pickups in a couple of years, I'm having the conscious realization that there is one thing that will almost always keep me from buying a card: I don't like the player name to be missing or cut off in any way, not even a little bit, whether it be by chipping or off-centering (top to bottom). I am an unabashed low grade guy...I actually prefer the aesthetics of your average poor/fair card...but as I said to someone recently, I've got to see the name. The face can be creased (not ideal, but I'll take it if the price is right), corners can be missing, hole punches, whatever. But I have to be able to clearly read the name.
So, what is it for you? What's the fatal flaw? An aspect of condition? Unable to grade? Price (I guess this really counts for all of us to some degree, and is hugely dependent on the rarity of the card)? Or maybe you just don't like the seller?

I realize more often than not you buy cards based on a weighted mix of factors...but anyone else have that one thing that holds you back every time?