While this dishy gossip column about how David Copperfield picks up women at his shows is quite detailed and lurid, I'm thinking it's most likely a hoax. There are just too many people involved, many of whom would've been complete strangers, for this to have been kept secret for any real length of time. In my experience, the chances of a secret getting out go up by the cube of the number of people involved.
Which is not to say he's not a complete nutter. Most successful artists are. I just don't think this particular nuttiness is for real. But I've been wrong before.