You are absolutely correct.Absolutely correct. The corner-cutting that is inevitable with any bargain-basement price-point manufacturing always begins with the quality-assurance process. Next in that line is acceptance of lower tolerances in the finished product. IOW, they don't check a finished item nearly as often (if at all), and if they do, they have lower spec compliance tolerances for what they will ship to the customer. If you're a manufacturer, it's always cheaper to let the customer do your QA. That appears to be a business model that works for some companies such as Titan Attachments.
Why it works is the number of consumers that will accept the poor quality product for the bargain-basement price.