Seriously? Why even bother?
I get it. We all get it, it's boring if you've run it several hundred times or more but still it's both stupid and arrogant to believe you're so important that 7 other people should have to run it without you because you're far too "busy" to help. Stupid because there will always be people like me who will call you out for being afk and then get you kicked from the group. Enjoy the queue as dps again.
It's always dps players too. Never had another tank or any healer go afk.