Dude, BlueSaint, not all people get comics graded strictly for sale on the aftermarket. I have considered getting my issue #1 of Invincible graded, but only because I bought Volume #1 of the Trade first. I fell in love with the comic, and Invincible has quickly become one of my favorite characters, and I would get it graded to preserve the quality.
Same thing would go if I had a copy of Detective Comics #27. The first appearance of Batman. If I had that, it would be graded in a heartbeat. And, I would never let it go. The only reason that I would sell it would be if I no longer had any need for it, and it would go to someone who appreciated it.
Also, comics have always been valued for the first appearance of a popular character. Like with Detective Comics #27. Sure, Issue 1 would be pretty valuable, but #27 is valued higher because it is the 1st appearance of Batman. Shoot, I still pick up comics for the 1st appearance of a character. Not because I want to make money, but because I like said character, and their fist appearance is valuable to me.