Billy Corgan reminds me of this kid that I performed with once in a high-school battle of the bands. We prepared and performed a handful of cover songs. But the dumbass that we had singing couldn't remember the lyrics, so he was literally standing up on stage holding a print-off of the lyrics in his hand, reading along to them as he sang. Even so, I think we were one of the better bands, but one of the judges told me later that we didn't place because it looked bad with the guy reading the lyrics off of a sheet of paper like that.
It was a common sense rationale for most people...