CD de-magnetizer, good idea or snake oil ?

Be sure to demagnetize the plastic jewel cases too, and let's not forget the wooden storage shelves.
Heck, just do the whole house while you're at it. Be sure toss the refrigerator magnet collection - those things will mess up the kitchen sound stage in every time.
 
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After all, it works for vinyl. 😉
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Best $2,715 I've never spent!
 
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Actually there is something that happens to the aluminum layer in the CD when place in strong AC magnetic field. A current is induced and may heat up some small deformations.

There certainly are some folks who have noticed a difference before and after being demagnetized!

Possibly a variation of the Munchausen effect.