You raise an interesting question.
If the real difference between Titanic effects and Pyramids is simply "time", I'd have to ask, "Why"?
What is the difference between a grave robber and an archeologist? Both do what they do for financial gain--one uses the cloak of "research" as a cover, but the archeologist still makes his living by robbing graves. What makes one acceptable, and the other detested?

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags