I think there's no problem with that but I see article that it is one of the blackhat method.. I forgot the article source im sorry..
Its ok No problem :| But You will be really Loosing some Visitors. Coz you look You sites name is 1234playz.com and still there is a site name 1234plays, and someone search for the keyword similar to your sites name including "plays",your site will simply go down than the other. Did you get that? try avoiding Mistypes since, Keyword accuracy with the domain names and titiles matter a lot in SERPS and Visitors Thanks