i can agree with austinp here . there is some setups,where one can benefit from 'revealing' his edge. something like a double bottom as a simplest example. the more people jump in to buy at whatever level,when price is in decline-the better for him.
You benefit from more participants doing the same trade in case they don't compete with you for liquidity. If they do, publicly revealing exact entry points would be plain stupid, especially in less liquid markets.
Having said that... I have witnessed a person once, who publicly revealed STRUCTURAL edge (back in late 2005). Which obviously killed it.

