I seem to recall though that there was one dev who posted on here at some point something along the lines of being absolutely against ever making any event girls available again after their original event run... Although in that same post it was acknowledged that the other devs didn't feel the same way. Obviously the other devs at least gave enough pushback on the idea to offer everything up again for the game's 1 year anniversary, but that was still just a short term offer and (to put it in the same terms you did) a massive ransom note. Here's hoping that they can settle on some sort of more permanent feature.