As we all know, comic books are not always in perfect condition. They are made from fragile paper and are easily prone to damage.
Which of these cause you the most grief?Rip/Tear
Sometimes not so bad but I have seen comics torn nearly in half. Unfortunate side affect is usually tape repair. That's adding insult to injury. Water
A drop or two isn't awful and sometimes hard to spot even. Severe water damage is nasty and oftentimes causes the book to be completely unreadable. Sunlight
I found a book one time that had another book on top of it and the part that was exposed to the sun was completely black. Kinda weird looking and it was only the cover but I was none too pleased. Defacing
When I was working for Brett he acquired a large Silver Age collection that had been previously owned by Suzette. You know how we know her name? She wrote it on the covers about 10-15 times and throughout the interior. Suzette!!!! Bends/Creases
Apparently, at one point it was acceptable practice to fold comics in half for shipping or sticking in your back pocket. Cutting
What's worse than flipping through a beautiful copy of an old book only to discover that some nimrod has cut out a panel, or a subscription ad, or a Marvel Value Stamp, etc. I was looking through a stack of old Flash comics that were in nice shape except that the Flash had been snipped out from all of the covers. Missing Pages
This is another insidious problem that is easy to miss. I once sent a comic to someone that was missing the c-fold completely. When I looked through it initially I didn't notice that the story went from pg 5 to pg 10. Man did I feel like an idiot.
I think I covered it all but let me know if I missed something.
And take care of your comics!