Again, you're looking at the remedies that can be taken upon finding infringement. The reason why a rights holder might decide to compete with an alleged infringing party (can do it through pricing, or any other means, such as marketing) is when they might not be sure if the goods offered by said party are counterfeit. But, you already stated in your value doctrine that there's no doubt they're counterfeit.
Well, I'm hoping you now have a better idea of why "price erosion" doesn't support your contention.
At this point, I feel we're going in circles. And mostly it has to do with your lack of understanding of how the pertinent laws apply and your general lack of understanding of the exclusive rights granted in patent/trademark/copyright laws. I was in your boat once, so you're hardly a rare case.
If you ever get sued or threatened to be sued under one of those laws (like it happened to me), I'm sure you and your lawyer will catch up rather quickly.