Quote from vhehn:
you got to be kidding. are people really that paranoid?
I only know a few cases where this level of paranoia is warranted. A trader I know would consistently account for 8-10-12% of the overall daily volume, using a fairly mechanical strategy. So he had attracted a lot of attention from the clearing firm (he hold exchange seats), rumour mills, as he would generate daily P&L of 400k on average. So he bought more seats, spread out his trading, and became less noticable on the radar screen.