Personally I don’t like to talk much about music, to me music is one language, speaking is another language, so instead of talking about a language I prefer to speak the language itself. Usually I spend a lot of time playing the instruments, so speaking about equipment and other stuff is a sort of healthy distraction to me which not only may help with equipment, but also provides me with some sort of balance.
Everyone has his own need to talk, to socialize, and products are just a comfortable subject to use.
Also, I find it interesting what DNJ does, because he shares his feelings about variety of products, with passion, and this is what a reviewer does. I value his opinion as he is a very experienced and talented musician.