there is a dark side to growth because nowadays, there are doctors in Mexico who will chemically castrate young boys in order to maximize growth. the concept is quite the opposite of what anyone here would want, and that is to lower serum androgens to the lowest they can be, thereby slowing down the maturation process. this process is not without its risks, the greatest which is depression from the chemical imbalance, but for the most part, young boys can grow from 6-12 inches, and for a young boy who's father is only 5 feet tall, well, having a son who can be 6-2 may convince many that the risk is well worth it.
rather than increase GH production, they reduce testosterone production with some of the same contraceptives used by women like Depo-Provera in order to inhibit Testosterone Production. The idea is actually rather old and has been around for close to 50 years, but given the political climate then and now, it is doubtful to ever take hold here, or in Mexico, but if you ask around, you can eventually find the doctors to do it.
as for growth after maturation of the epiphyses, there have been attempts (i believe in France and Italy mostly) to increase growth by way of mechanical "braces" which force the bone to grow. as i understood it though, this was an extremely painful process and the person who had it done was always walking in pain due to the stretching that is being forced on the femur, tibia and fibula, and frankly, the quality of life that is limited and the risk of bone decalcification if done wrong is a frightening though ....
but , being a short person myself who nearly a decade ago seriously considered such options, i can assure you that such methods exist, and little by little will be improved.... will they be popular? probably not, but they are there ...