Editing your DNA can be dangerous or even deadly if it doesn't work. Modern methods have mostly solved this, but there is still a lot of hesitancy due to prior failures/tragic deaths.
It is also ethically foggy. Somatic edits, edits that will die with you and do not change your sperm or eggs, are one thing, but when you start making germline changes, that impacts everyone who may inherit your genes. You may consent to a germline change, but will your children? Or your children's children's children? You may have the money now to make they change, but will they have the money to change it back?
Small genetic changes also have a complex spectrum of phenotype outcomes. If you start making germline changes that are not found in nature or are under-studied, that can have compounding unintended consequences. For example, if you spec into a dozen intelligence SNPs, that may also increase your risk for a pandora's box of mental illnesses.
So no, economies of scale will not solve this. It would be a disaster.