This is such a common problem and certainly not restricted to only this site. I have seen the same behaviour on every other site I have been on.
As others have noted, it's hard too tell if it's laziness, desperation or an attempt to 'beat the odds'.
Just because this is promoted as a sex site, it doesn't mean that courtesy a respect should be tossed out the window whether it's when sending emails or contacting in the chat room.

