I totally get why you'd want a brand new $1200 GPU to not have any issues. But why do you have to get both cards replaced if only one has a problem?
I maybe explained this horribly.
I bought two cards. One card out of the box didn't work. I contacted NVidia and got that card replaced. When installing the replacement card, everything seems to work fine in SLI, but I stepped around to the side to see that the other (original) card I had bought, the logo didn't light up. So, neither of the original cards worked as intended, and will be using two replacement cards for them.