Simple, I would first write down my name as dying in three-hundred years. Not so I could live long, but because once a name is written in a Death Note, it can't be written there again.
Second, I would then rip out the regenerating pages and sell them to people with grudges to settle while I would, on occasion ruthlessly kill people.
yeah_so_no said:
I wouldn't use it, because of the fine print, yo--you use the Death Note even once, and when you die, that is IT, because your soul won't go to Heaven OR Hell, which means you are SOL in the end. It's not worth it.
You didn't pay attention to the ending did you? It's just something the Shinigami say to confuse people, in the end, they say that no one goes to heaven or hell and that their soul enters Mu where it essentially ceases to exist.