Unfortunately (or fortunately?) the track record of billionaires throwing money at problems unrelated to how they made their billions is not great. Yachts are easy to buy, cancer cures and life extension technologies are not so easy to buy.
This becoming viable would do to high-status men what white lead makeup did to high status women in the 19th century. Being tall isn’t as important as being taller than average, so you’d create an arms race among those who could afford the treatment. Which itself would strengthen the association between being short and being poor. And we all know how this ends, with a 7 foot tall millionaires dying of heart attacks as their circulatory system doesn’t naturally scale with their height.