Old people in nursing homes don't get out much, and yet they're the ones that are dying. The fact is that the virus spreads because people don't always die from it, and so they go around spreading it to people who will. Most people probably won't know that they have it until they've spread it to 3 more people.

Your strategy will probably keep you alive, but the same is not guaranteed for many millions of people that are old or with immune system complications.