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I have also heard story of when someone gave the correct advice, the sale actually went up for that one occasion. The story actually went like this, someone went into a pet store and plan to simply buy a fish bowl for a goldfish, after he was told all the basic information on how the fish should be kept, he left the store with a 180 gallon tank and all the needed equipments. I don't know how often this happen, but many people are suspicious of others, and probably would see the good advices as "marketing strategy", while see the true marketing of poorly designed products such as an unsuitable fish bowl as the correct way to go.
Stores just want to make sales with the least trouble possible. Most of them have very short guarantee time for the pets they sell. Walmart for example, they have only 48~72 hours guarantee for their fish. So they are not worried about losing money due to the wrong advices they give. In fact, the more often pets die, the more often the pet owners might return to buy more. I do not have the exactly statistics, but I always think the wrong advices also make them lose potential customers for more pet supplies by having more newbies giving up upon the death of their first pet.
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