It is my policy as a comics reader to support anything written by Alan Moore by buying and reading it. I cannot guarantee to like all of it because Moore's output is extremely diverse. Lost Girls written by Moore and drawn by Melinda Gebbie is an expensive, high quality, hardback graphic trilogy. It is also pornography which I read without a lot of pleasure. Can "erotica" have the same level of plot and characterisation as other fiction and, if so, does Moore succeed here? I have my boxed set of the trilogy and might reread it.
Before Watchmen is a very high quality production in terms of writing and art. The covers accurately depict the Watchmen characters. I do not necessarily agree with Moore that prequels or sequels to his graphic novel would be dilutions. However, I do believe that, in this case, any worthwhile prequels or sequels would have to be written by the characters' creator. Since he does not want to do this, the matter should rest there. I will not buy any BeforeWatchmen comics.