Cows in general are people who almost always validate all bad assumptions and rarely validate good assumptions, so to me it's no surprise that many people's guts go with the bad ahead of the good, this is especially true because we want to see funny things happen, so we have an innate bias for what sounds funnier/worse for the cow.
I know it can be annoying to some of us who know what's what, but cow watching is a process that makes jaded people, myself included.
I think the only reason I would believe that Chris didn't forge Barb's signature is that if he set out to do it, he would utterly fuck it up, Chris is just that much of a fuck-up, the only successes he ever had are entirely unintentional.
One of the few good things you can say about Chris is that he is a born merchant. He really knows how to push merch that other people would consider to be utterly unsellable. You can argue that he's selling to fellow speds, but the point is he figured out how to monetize those spergs, and that's something I honestly respect, even though he probably couldn't tell you how he did it, but he did it.
But then again, like I said above the quote, he is a born fuck-up, so it's inevitable that we will find out later that he kept the money and didn't ship the products, or shipped them improperly, or doxed the customer, not to mention him constantly fucking up on pricing and savings and getting stuck without shipping money.