I was a software engineer for 12 years and this site is not rocket science. I realize you want to make money, but your drop rate for your event girls is horrible. They is no monetary reason to make this so difficult. So many clicks equals a greater opportunity to receive one of the girls. Guess what you way it isn't working. Listen to the complaints. You are slowly pissing off those who play the game for fun and hence not gaining an opportunity to receive any money from those individuals. Open up an in game store for new gear / girls / or maybe a once a day epic pachinko drawing. Get inventive. Using an outdated psychological model to run your game is counter intuitive. If you do not know what the last sentence meant than your game is doomed.
PS The next person that mentions the word luck needs to realize there is code involved in you getting your next harem girl and it can be made as easy or hard as the game developers like. If you believe in something does it make it real.