That are exactly my thoughts.
Au contraire. I would like to object. I played the entire game once in the "hostile" path. Now, after I noticed that there are no real, satisfying rewards, I do not feel like playing the other possible paths (true friendship and fake friendshi path), but I am considering to turn my back to that game. It is too much grinding for too little reward.
If the developers want to keep the players they should provide _more_ content, not less. Even after the MC had fucked Lisa, this doesn't imply there wouldn't be left any room for more content. For example, Olivia is another character which could be developed. There are even options for a FFM threesome (Lisa, Olivia, Max). Or Max could try to corrupt Lisa even more to become the school slut. Etc. pp.
Saying that the developers must keep the pace slow in order to keep player involved with the game sounds like a lame excuse for the developers having no idea what should come next.