There are a couple of instances I can think of why somebody might want to cancel PR status.
1. They made a mistake by not including a common law partner, can't sponsor them and would like to apply again as a couple.
2. They may be applying for PR somewhere else and the other country, knowing that they are PR of Canada refuses to grant them PR unless they cancel the Canadian one.
3. They may know they will be away long enough to lose their PR, for example because of studies and would like to cancel their PR before it expires to start a new sponsorship or application in time to get the PR again by the time they come back.
4. They might be really pissed off at Canada for some reason and want to make a statement before they leave forever.
Leon,
I made that mistake, I didn't include my son and my wife in my records. Can I sponsor them anyway? Or should I cancel my pr card? How long will we Wait for applying again? Can we apply for provincial nominee? What options do we have?