The don't get the surgery because it has long terms complications
Many of them do drugs etc which are way more hazardous than LL. So no that's not the main reason.
In reality they simply don't do LL because women don't need it and men, when they become famous, they have already a specific appearance so LL won't helm then much. Danny De Vito wouldn't suddenly become a woman magnet only becsuse he gained 7-8cm more.
Only a man who is not already famous can gain things from LL and persue a career after it but it will keep it strictly confidential so there is no way to know it.
Personally I have some suspicions that Bieber did LL because he was not more than 1.70 till he was 20 and after that he became about 1.75 which can't happen without LL at that age, unless he just wears too tall elevator shoes and he is still 1.70.
Other than him I don't have any suspicion of any other star that may did LL.