I don't see the bias argument. I use numerous CG's products, that are clearly not equivalent to PB's products. Their rim cleaner (sucks), for example, is nothing like S+R (best on the market), and they lack a counterpart to S+G or Natural Look. Now, if only I could source those three

. I've got nothing against PB's (hell, I wear their t-shirt), but if I can get the same product (at least on a functional level, if not necessarily a chemical one), at half the cost, I'd have to be a fool not to do so.
CG's private labels too, cept they don't even bother to change the labels. A bunch of their products came with Warner Chemical labels. Yes, I could order those ones specifically from Warner, and save a few bucks, but I don't do so out of convenience. That's the only argument I could see towards choosing PB's in this manner.