Whether or not it is cheap or not depends on how much you value your data.
It's like people who balk at spending an extra $200 to mirror their data, or to provide a hot spare for their RAID array. How much would you be willing to spend to get back your data after you discover it's been vaporized? What kind of chances are you willing to take against that eventuality happen?
It will vary depending on each person, but traditional people are terrible and figuring out cost/benefit tradeoffs.