There is a network effect to consider, too. The initial group may require $1k, but the asking price would likely drop as the remaining number of users does.
This is supposed to be a tool to estimate the value, not to get everyone to stop using Facebook: how much do we need to pay a given user to stop using Facebook, provided that nobody else stops using Facebook?
If we put a thermometer on every cubic millimeter of an object, we will probably significantly affect its temperature; but we don't do that; we use one small thermometer against a much larger object, so the transfer of heat between the two has a negligible effect on the temperature.
But neither berbec nor kazinator said, or even seemed to imply, that ….
I wish that were true, but if everyone stopped using Facebook they could still build shadow profiles for everyone, as they do for people that do not have accounts, and they could just sell this data out.
Facebook's value is derived entirely from the information generated from its user base.
Network effects are premised on the value of the network increasing in value as more users join. By definition then, the value of the network drops as people drop off.
While the speed of adoption might always be > speed of deletion, there is certainly an auto-catalytic effect to people deleting FB, or not using/posting to FB as much.