"I, my dear sir, am a being who can travel through time.  I have seen the distant past, the distant future, and all points between.  Your fortune is best made by moving to Canada and investing in the Hudson's Bay Company.  As for Atlantis..."  The Spoiler rattles off the coordinates.  "But I daresay, knowing its location and going to the sunken city are two different things, and bringing back conclusive proof another thing altogether."