No? Most people would struggle to save up hundreds of thousands of dollars to pay for the cancer or any chronic diseases they plan (?) to get at some point. Aside from that, you have no idea what medical conditions you're going to get, and when. Even if you can save the money, it's a massive amount of money sitting around in cash (can't invest it because you could need it any time), which would be a huge waste. And some people would save it all up and never end up needing it.