Clearly most of you have never worked retail in a pet store. The amount of people that come in that are not hobbyists are why questions are asked. See how many people try to buy "nemo" and a fish bowl, and you will quickly see why.
Myself I generally ask two questions. What size of tank are the fish going to? How long has the tank been set up and running? As well any potential large growing fish, or incompatible fish are advised about. Now if this is too much probing and prying for you, I feel this reflects more on your self as a fish keeper than anything.
It is true the vast majority of use have never worked retail in pet stores and I can understand you get asked a lot of stupid questions every day. That is the scenario most people are in. Most of our customers are stupid to the things that we sell them (be it service or product).
Those two question you ask are perfectly fine. The ones most of us have an issue with are not questions, but advice. I personally get sick of hearing the guy in Petsmart who keeps giving awful advice on things like an Oscar and a bunch of guppies getting along forever, or that I shouldn't gravel vac my gravel more than once every two months because all the good bacteria will be lost because the filter doesn't hold any. Things like that, which show a severe lack of knowledge. And that lack of knowledge will bite the company in the ass when they lose a customer because the dummy in aquatics sells an Oscar to a little girl and it eats Mr. Goldie and all his friends. Or they recommend the instant bacteria (which in my experience doesn't work even 1/4 as well as a fish less cycle or seeding a new aquarium with old media) and the customer loses all of their fish, so they think they are bad at it or lose heart and quit, which doesn't bring in any more money to the company.
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