That line bugs me too. We're mixing figures of speech with statistics and that always always goes sideways (sometimes it looks like chicanery). What does it mean to get the 'average person' to quit? Half of people are still on FB? Almost nobody is still on FB? Average height makes sense, because it's a continuum. How do you average discontinuous values? What's the average gender of Americans?

If I'm reading the same data they are, the median price is $730. Which means if you offered everybody $730 half of them would quit. A few of those people would be really happy because all they wanted was $100.

If you were a deranged billionaire and you decided to burn Facebook, you might be able to get half of them to quit at an average of $400 apiece. But even that doesn't make sense because people are people. If my neighbor already got a check for $900 what are you doing giving me this check for $450? I want $900, same as him. Practically, you'd just have to cut checks for $730 and offer everyone the same amount, which means $1000 isn't a real number either. Because I'm sure as hell not gonna take $450 if my buddy knows the guy who got $5000. So it's $1000 checks and you get 65% of people to quit.