Need any help with your packing?

A famous art forger who has done time as a result of his activities has written a book in which he claims that a chalk drawing generally attributed to Leonardo Da Vinci and valued at £100m is in fact his work and depicts a check-out girl with whom he used to work at a Co-op store in Bolton back in the 70s.  If this is proved - or even just accepted - to be true, the work becomes pretty well worthless. But we've been down this road before - it's the same drawing!  How can it be that one minute it's worth £100m and the next, nothing?  I've said it before - doesn't this just point up the ridiculous pretentiousness of the art world?