I would think if there was a game like those, once you got to certain "chapters" maybe you could earn GoldPieces. In a way similar to a faucet, you put your address in, play the game, and get payouts after you hit certain "goalposts" or "levels" throughout the game. But obviously you could only do it once or you'd know how to do it everytime. But if something like that could be done, maybe it could be like King's Quest (which had 8 games in the series), and just continue on with new games after you beat each one.
That's an interesting idea... I'll have to chat to my programmer to see if AGS would be capable of something like that. I'd certainly like to make it possible to at least buy the games using GP / HYPER, which should certainly be possible (well definitely I know the HYPER store is fully operational - sorry I don't know much about GP just yet!)