Luxury car buyers may immediately lose $5k, but it's not burned, someone else gains it. Depreciation isn't necessarily the destruction of value, that value could be either immediately transferred to the seller, or eventually transferred to the buyer. In the extreme case where you buy a car for $60k and then sell it the next day for $55k, that's the same as giving away $5k to the second buyer, so that they can pay $60k for the same car. Alternatively, it's the same as buying the car for the $55k that it's worth when you get it, but also transferring an additional $5k to the seller.
Buying $5k worth of food just to let it expire, that would be a destruction of value, and maybe it's clearer how it's an irresponsible thing to do.