The vast majority of what I made was over 6 months of a LOT of DB work. I would say that should be worth a free new game.
So a conversion rate of $60/VG$20,0000 = 0.3 cents per VG$ sounds fair. Even the best spammers couldn't make that much in 6 months.
Soriku only has ~6.5k and he is the highest member that doesn't work in the DB.
EDIT: of course who knows when or how VG$ will be used for anything else.