When the first thing you notice and the only reason you buy a CD is because you can recognize Jamie McKelvie's artwork almost from across the record store:
It's not a bad CD, either. It's very "English," and the lead singer doesn't have the greatest voice (not that that's every stopped great bands from existing, I know), but the lyrics are pretty keen and the music is good, so there's that. But yes, I bought a CD strictly because of the cover art. I didn't know McKelvie was doing the artwork for it (he's been promoting it on his tumblr, but I didn't see it), but it was enough to get me to buy the recording! Yay, comic book artists!