Out of all BL games, Shingakkou and Hashihime are my absolute favorites. I'd love to see Shingakkou get an English translation someday, but it deals with pretty controversial themes, so I doubt any official localizer will ever pick it up.
I generally don't like these kinds of systems in otome games. I prefer paying once and getting all the content in the game. Otherwise, it's just milking the players for money.