Do you use a trainer tire?
You might net out saving a little money on tires. I don't bother. It's just going to cost you some tire wear. And you can use a tire that's worn past the point you would trust it on the road.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.