If you're talking about those half logs you see at pet stores, those aren't proper hides, anyway. If you're talking about the whole logs with just the center cut out so a snake can crawl in there, they're a pain to get your snake out of. Like Vypyrz said, it would be hard to clean poop/pee off a piece of wood. There have been a few times when I've found poop on the side of my BP's hides and had to clean it off.
You should just stick to plastic/resin hides that are easy to clean and easy to get your snake out of.
That's why you bake the wood in the oven to sterilize it. My BP had a mild case of mites and a piece of driftwood in his cage. I baked the wood in the oven, sprayed a light coating of PAM on it, and haven't seen a mite since.