well yea I won't do 10x epic for a very long time. First, Kobans don't raise normally fast unless your getting packages, etc. So it will be very very slow anyway. And yes, you don't want to waste that "free girl" on a normal boss drop unless you are much further into the game where the event girls will have a better chance. So new players don't want to use kobans for a good chance for a normal girl drop, but more advanced players who don't have many boss girl drops left due to not many boss's left, have a much higher chance during events to get a non-boss girl, and they might go ahead and just try for the event girls. I havent' played 10x epic simply because Ive been playing a little while and only have 2k kobans, they don't come very fast. So those are ALWAYS going to be either when I'm bored with the game, or very far into the future when I have collected most of the normal girls.
but really the regular money is only for the market, and raising battle stats. Experience isn't a huge deal until your much higher levels, low level girls don't require epic experience books to max out fast. Plus good to save raising non-battle girls for events. Affection gives you more collectable money, but at a longer time frame so higher affection is great for those who don't get on as much during the day and can't collect as often. Battle stats? well, unless you find that awesome legendary item in the market, not really much to spend money on there either. I'll just keep doing a little of everything until I see something that really stands out that is different than the others.
Thanks all. Truthfully I like the stuff in the game, and really the xxx picture stuff I don't even worry about any more, its kinda of fades off when you have regular porn on the internet you can look at. Doing the actual game stuff is much more fun.