By paying money I meant specifically the hardware keys, of which I would also need at least two, just for backup/availability reasons.

Yes, if I lose my phone and my passords are all just on there, I am in trouble, but I currently don't handle it that way.

But if a service relies on specifically my phone (or any other single device) as a factor and it breaks or gets lost, I’m potentially in trouble and I don’t like that.