who are they selling to? And why so many people?
EDIT: sorry, I read another response, they are selling to ad companies. Does that really demand hunderds, over 1000 people, though? At some point I feel they are costing more than what the next increment can bring in.
I understand your point but even if there was only 100 engineers (which would not be enough) I can't imagine what the other 1900 administrative people are doing. It's an internet forum, and unlike Twitter and other social media (where I assume they simply have hundreds of mods) they successfully outsourced moderation to volunteers.
Is it all just legal suits? The customers are the users and admins are horrible at responding to user requests (be it users or mods), so it doesn't feel lik customer service is using those resources.