It would never be that though. It would be some sort of EA games style- "for 50,000 bucks we will move the class C genes that cause bleeding asshole syndrome and ingrown nails, but Parkinsons falls in the $100,000 class B tier, and cancers fall in class AA tiers, which is only $140,000 (save 14% during the 9/11 sale!)"

And then years later, you'll find out that some wealthy family paid $30 and a hand job for the AAA+ Diamond Supreme+ tier, which is why they are cancer resistant, HIV resistant, have a 19 inch penis, and live for 140 years even though their grandfather was dumber than a box of rocks and made all his money ripping off contractors for his failing casinos and bad property deals.

And those tiers? Each one only costs $20 to manufacture the medicines for, but that EA company has a patent that they change juuuuuust enough to renew every 20 years.