Outside of tech and disaster recovery, people _really_ don't understand that some redundancy--in this context--is a good thing.
The idea of paying for a backup system, or even having one on standby for situations like this is just not on people's minds, or if it is, it's simply not affordable because it would cost you too much compared to your competition.
Razor thin margins and generally getting away with it is what makes this work. Until it doesn't.
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Or, they get the bad idea that they can just pay one supplier and that supplier will deal with the redundancy for them. When the redundancy needs to be at supplier level.