Are you a spine breaker? Or a dog-earer? Do you expect to keep your books in pristine condition even after you have read them? Does watching other readers bend the cover all the way round make you flinch or squeal in pain?
I'm not a prisine book person. I don't crack spines because that makes the pages fall out. I treat library books well and would never turn corners on those or on any book i've borrowed from someone. For ones i own though i'll dog-ear corners and lay them open face down. With trade paperbacks, at least thin ones, i will roll the cover back sometimes but since i read so quickly it doesn't stay that way very long!
On a different note, I hate to admit i may not finish RIP! ACK! I intend to though. I am halfway through Rises the Night which I'll definitely finish but then i've got to tear through another by tomorrow midnight! hmmm. I'm off tomorrow but have to run to 2 dr's appts and also go get new tags for my car. and i'm going to a play tonight, a spooky Bell Witch based one.