Some women, like me for instance, can’t grow long hair for a variety of valid reasons such as illness, hair type, genetics. Same with nails.
I would LOVE to have some hair extensions. It would be the first time in my entire life that I’d had long hair.
And the nails? Well, I do my own manicures too, and sculpt my own nails as well.
Obviously, each person has to make her own cost-benefit calculation.