The only reason to use this technique is if you want to be able to opt out of all incoming connections when they start to damage the domain. Some spammers are dealing with a technique called Ebb and Burn. They are gobbling up a huge amount of links to a new similar-sounding domain in no time. The diversion points to all links to the real domain and ranks real estate.
After a while, Google catches up on links and devalues spam. This is the part called burned when all links are burned by Google and no longer counts. It is at this point that the spammer can cancel the redirects, immediately removing all spam links in one click.
It is not advisable to use a legitimate site strategy. But it is useful to know what other people are up to as there is power in knowledge.