For the same reason all of the rest of us still participate to varying degrees, or simply lurk....even those who "quit", and you all know who you are.
You would not believe who reads this site, frankly.
It's the only place in the world with this kind of action, debate, minutiae, verbosity, brilliance, assininity, eloquence, civility, acrimony and intrigue dedicated to something we are all addicted to in one form or another and it's ongoing 24 hours a day, 7 days a week.
It's instantaneous, yet it's retrospective. It's thoughtful and reactionary. It's current and historical. It's relevant, irrelevant, reverent, and blasphemous.
Resistance is futile.