The builder of an array that is DIY, is often going to use techniques of design that are way too expensive than the manufacturer. But the manufacturer is likely to use individual raw speakers which are way more expensive than the average DIYer.Herein lies essential conflict. The DIYer wants to believe that s/he has a quality system, and the manufacturer doesn't want the buying public to think that they can actually build a quality system for less.
As long as both are considered an essential part of the forum, they will be at each others throats all the time. This is especially the case with arrays since they take very very long for the DIYer to build.
Its a further decision that any moderator here must consider.