The purpose and main goal of the lab grown diamond industry is not to grow diamond gemstones. The main purpose of the lab diamond industry is for high tech applications of diamonds such as laser lenses, surgical knives, water purification devices, high pressure anvils, semi-conductors, and more.
The price of each of these functional diamonds is more than the prices of a diamond gemstone of the same size. Thus, only grown diamonds that are not perfect enough for high tech applications are cut and polished and sold to consumers as gemstones.
When you purchase a lab grown diamond, you are investing in the future of humanity. Your purchase of a lab grown diamond directly funds research and development efforts to improve the use and efficiency of lab diamonds in the next generation of technological advancement and achievement.