It's pretty much in line with the "Lizardman Constant," named after a poll that 4% of Americans think the world is run by lizard people. You can ask anything in a poll and you'll pretty much always get around 4% trolling or whatever.
Not Greenland, but the CBC did find a guy that wanted Canada to be part of the US. That dude's entire motivation in life was money and didn't seem to have any thoughts on any other subject.