That's pretty much what I was getting at. For those who just enjoy the work involved in re-creating a given formula, and enjoy mixing their own chemicals, I have no argument against it. Go for it.
What I meant in the specific case of HC-110 is that some of the other reasons normally given for home brewing don't really apply: Sometimes you can save money by home mixing a clone, sometimes its a pain to mix too much (5 liters of XTOL for example), sometimes you want to recreate the particular properties of a developer no longer commercially available, and sometimes you want to create something with a longer shelf life. However in the case of HC-110, it's cheap, lasts a hell of a long time, and there's nothing very special about it. So it seems like it would be a monumental effort to make a clone without much reason behind it.