Yes, I do not feel uv's should really be neccessary on a tank either. If you keep your water free of nitrates and phosphates, you should not have cloudy water. If you do not cause the fish to have any stress (and you QT your fish), there is no way you should have ich. As stated, the money spent for a uv could be better spent on a better skimmer, more live rock, better filtration, etc. All these things are more important than a UV.
Also, there was no way he was starting a rumor about anything. If he has read an article, he has read an article. And instead of scaring someone away from buying one, maybe he was trying to save someone the money from feeling the need to have to buy one in order to have clear and parasite free fish. If an lfs hears that you might be interested in buying one, they do not usually tell you that you do not need one. They will usually just sell it to you because that is more money in their pocket.