I once read an article (I'll try to find it and post the link) that had the true story about laser rot. Apparently a guy did a study of 99 laserdiscs and found that one of them got worse over time. The aluminum inside the disc began to oxydize. He called it laser rot. Everything I've read about it say that it's mostly caused by disc missuse. Mostly bending of the disc and poor handleing. I would say just be nice to your discs and they will be nice to you.

I'm off to find that link now...