Well I know where I stand on this question. Why brew a beer that I can buy. But I would like to see where everyone else stands. There are alot of commercial examples that I like and have done my best to "one up them" but I feel that brewerys are making beer for profit and thats where homebrewers have the advantage. Every time that I clone a beer I do a side by side taste test and the commercial example just seems to be a watered down version of my brew. Yes I am partial to my stuff so I have done blind comparisons with friends and most of the time they like the homebrew better. Commercial beers are a great way to try all kinds of examples but for me I know that I can do better.