If they put it on Steam, there's a chance that the game will have a price tag here as well. If it's their intent to keep it free, then that would be a bad idea.
or like many FTP games, DLC's are where money is made. In the case of an interactive VN like Harem Hotel, not much need for that. When or IF this becomes fully finished (I hope it keeps evolving), I'm not sure how many current "users" would pay much more if it's not "brand new". ("Myst" being one example.)