I grow potatoes for personal consumption but also sell excesses if the harvest was good. Most bad potatoes are either rot or diseases, but it is also possible for potatoes to be damaged by slimes, mole crickets or cockchafer beetle larvae. Some weeds like elymus repens (couch grass) grow their roots through tubers. Earthworms don’t eat potatoes, but sometimes I find them inside an already decaying potato after something else damaged it and caused it to rot, same with woodlouse.
Damaged potatoes have unappealing appearance and also don’t store well. Selling these is nigh impossible, probably only for livestock feed. My guess is that farmers sort their potatoes and only sell good ones (I do sort as well), so chances to find bad potatoes in a grocery store are low.
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