Why not spending the probably huge amount of money in a cure instead of monitoring devices ?
Well, because why kill the Golden Egg Goose ? Millions of people who have to take pills every day are good recurent money. If you cure them, no more cash.
(Well it's the middle of the night, I can't sleep and fill a little bit bitter...)
One more thing. I'm a bit scared with all the private companies collecting personal medical datas. But maybe I've read too much science fiction.