i think GnR will easily sell big, even if it was shite (which we know it wont be), people would buy out of interest, or because it has GnR and they dont know the old band didnt get back together.
look at VR, now i happen to like VR, but contraband sold about 3 million worldwide (i think?), and people bought that on the basis of it bening slash, duff, and matt with stp old singer, they didnt need to hear the material, they just bought
fans buy cds, curious people download.
I know its a shame, but its just how it is....