I was in the same boat as the guys that did not think it was needed. Then after seeing the veteran guys with massive massive tanks and extremely expensive stock, you could say a filter is a filter, a heater is a heater, and so on. However, you see those devastating threads where everything is lost because of x factor. Once you cross the threshold of being a monster fish keeper, you will do and buy almost anything that can mitigate a foreseeable disaster. In this case, a uv sterilizer on the low end is 50bucks( ?) up to 300, break that down per day on the high end it's a buck of insurance for me per day.