How to Pick Expired Domains

Margrav made a video on or picking expired domains. It might be released at the time at which these pot casts is coming out. If you already set ar year or two into your sit, can you just buy another expire domain with a bunch of links and three or one redirecte? And why it does is, like in a lot of niches, the year 20 to forty, you can do some damage already. You can build a profitable site just putting content on that domain.