It's mostly because cosmetic LL is still a taboo topic and let's be honest out of every cosmetic procedures LL requiers tons of rehab, blood and tears, it's just not 1 visit and height wizard zip-zaps you to be 10cm taller. Even after it you can have complications and in the worst scenario you can kiss your legs goodbye.
Besides a lot of people can't get an idea that height can be a barrier for us mostly because they were never in our boots(basically means height is worth nothing because im average and i never had problems about it).
And about confidence.... problem is a lot of people exaggerate that their height is an actual problem(mostly people around 5'9). Imho the real problems begin when you are for example short stature(under 3rd percentile for you age) because that kind of people have problems and not always about their sexual life(example, i can't get a job for like 1,5 year, one of the employers basically told me that im "too fragile" even when i workout for quite a time and second actually asked me if im full adult....).
But i'm sorry, if you are 5'9 and you can't score chicks(because a lot of people dwell on it) you are not going to score after LL. Invest that money in a shrink, trust me talking helps.