Thank you all who replied. You have convinced me that paying for Event Pach is not worth it.
So I am going to stick my neck out. If you play Pach & win a Girl, does that do you any good? And yes, I do know that most of you have bigger harems than me, & if you have a huge harem you can boast & they earn money but...
Suppose that you had 10 Legendary Girls at max level plus 200 others. In Battle: once you have chosen your team of 3, it does not matter how many others you have, just sitting and twiddling their ...er... thumbs. If you challenge a champion, you cannot choose your team. You get given a draft of 10 chosen at random, almost certainly far less sexy than if you could choose. So you would do better without the 200 others.
Logically there should be an arrangement that if you neglect a Girl for too long, she will become unhappy & leave.
Rather than having a huge harem I would much rather be able to engage in sex scenes with a smaller harem.