Poor housing

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They may run into problems keeping their osmotic balance right. Kind of like putting a freshwater fish in saltwater and vice versa.
Also these frogs love dirt, it's part of their lively hood. In nature these frogs burrow into soil and leaf litter with only their eyes protruding waiting for prey to come by. I prefer to keep animals as natural as possible since captive life is horrifically unnatural as it is.

This is kind of how I look at it, even if they don't get sick it may give the frog a shy or mean behavior.As seth said "Lots of horned frogs have been kept that way over the years and if the water is kept clean they will do fine for quite a long while." Could that be contributing to the ill temperment and reputation alot of these horned frogs get, from not housing them as a pet but, more like a comodity.There wasn't anything else in there with them at all. Seem to be a bit unusual and mean in my book. I've got two pacmans and they've got plenty of water to be in if they want, I never see them in water much, see what i mean below....all i know is I love pets and animals and it doesn't matter if your getting one to be a pet or getting one to sell as a pet; you should be responsible for them 100%. I'd prefer to buy and own a pet who was taken care of properly and not stacked on the shelf like a can of beans...