Whoo i can contribute. This may very well be a repost However i actually have tested this so...
VoVgames will take ur unactive lvl 60s and farm with them. Currently i just gave them mine and they added game time. So at the very least this is a way to get gametime.
It is confirmed that i gave them an account with a lvl 60 on it.
I am currently tracking them to see what they are doing. In a couple days i may take back the account and i will have gametime. However if i am paitent i maybe able to get BC from them and a lvl 70 so we will. I will keep u guys posted