imagine it, instead of a product key. each download has a bitcoin public key that customers put funds into which then is used to allow customers to prove they did not download a illegal copy of the game, and also to pay for ingame items
I can try imagining what Clark Kent and Lois Lane's babies would look like too: but what would be the point?
the point would be, no need for credit cards to buy expensive upgrade packs or ammo clips. you can simply spend satoshi dust to get little items.
why spend $5 to buy 100 ammo clips for instance. which for some kids means asking their parents for their credit card. were as kids can by 1 clip of ammo for 0.0001btc knowing he doesnt need to pester his parents or spend more then what is needed. and the game devs get lots of little payment instead of trying to tempt users to make one-off or irregular payments.
i know i have experienced it many times when a game asks for $5 for an upgrade pack containing 30 items. id rather just buy the single item for a few pennies, knowing i can repeat buy that item, rather then wasting larger sums