number of retrieved eggs among those who already have an IVF kid (who already experienced a successful IVF)

I think when women said they got more than 20 retrieved eggs, the final results seem to lead to a very low successful outcome here. I am not sure if it's a sample bias because people tend to post their tragic stories more than those who have successful outcomes to express their sorrow and pain and to get support. Or, I would like to know if the ideal retrieved egg number would be in between 10 and 20 among women who already had a successful IVF experience so I created this poll to see which group shows more successful cases.