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I was using active users as a metric in my parent comment, using the same measure Facebook has 750M active users for a cost of $227USD per user.

That only strengthens my argument: market values at ~225 / active user

And how many decades will Facebook need to make that money from its users? How many decades will it need to make it from Whatsapp?

Facebook made $2.14 / user in Q4 2013 [0]. That means they need more than 26 years to return that value.

Or they need to find a way to increase revenue greatly without alienating users too much...

1.2B is monthly active, 750 is daily active. FB doesn't publish just registered users.