Originally Posted by cbp

1. Why would you want to do it? What advantage do you get by doing it?

2. I checked the site in your profile and what you are doing is, IMHO, called spam (you do have 6 or7 URL's). To Google you do not have multiple domains pointing to the same site - you have multiple copies of the same site... its looks as though Google have already got you with the duplicate content penalty/filter.

CBP