The total cost of ownership to self monitor for a potential patient you quoted is about $1000 with an iPhone and an Apple Watch - fine. To make a blunt dollar amount is misleading, to say the least. How about quoting a similar cost for an alternative smartphone and a monitoring device (smartwatch or Fitbit type device) combo simultaneously to see how much more the Apple system costs, and if the comparison is fair? Especially, if the costs are not compromised by data mining or advertising interests.
An iPhone SE 32GB and the previous generation Apple Watch 3 together cost about $600 with tax. The similar Android can cost $300-400 - are you willing to bet a life on the basis of this savings?