Does having a lot of forwarded key word rich masked domains pointed to one site help

Does having a lot of forwarded key word rich masked domains pointed to one site help with SEO? Need facts not fiction. I have aprx 20 keyword rich urls pointing to my main site. I added key word phrase here Masked Description Meta Tag and put all my keywords here Masked Keyword Meta Tag: The site where I bought all the domains from is www.zuxm.com (does it make a differnce where I buy the domain?. I did the Redirect Type: 301 Moved Permanently . I also did the Masked Title with key word phrase. Is what i'm doing helping my main site. What do the bots see? Thanks for helping in advance.