We must get back to simple economics. Why is LEPIN successful in it's clones? Because there is an active demand that is currently not being supplied by the 1st or 2nd hand market. If anything, this says just how superficially inflated the LEGO 2nd hand market values are at the moment.
Yes, LEGO is losing sales on retired - cloned products. It's called an opportunity cost/loss. LEPIN's continued market penetration (especially new sets) will force LEGO to take some sort of action to correct the situation. LEPIN operating in China is somewhat insulated from IP protections thru their court system. So if LEGO wants to hurt the clone industry, they need to start re-releasing the products that LEPIN is doing so well on.
Supposedly not a 100% clone though, I don't care though. I love LEGO's pirate line, I've had one since I was a boy. I'm actually kind of shocked the Pirate line isn't a continued set line up for LEGO.
The 2nd hand market "scalpers" are in for a shock sooner or later, as LEGO does in fact begin to re-release past products.
In my opinion, the entire 2nd hand market is an inflated market that is PRIME to burst. They forget these are TOYS at heart. LEGO retires products, which limits supply naturally. But these 2nd hand scalpers accelerate the supply reductions by buying mass quantities of the product. They then turn to online resell sites and set artificial high prices. Often times they will sit on products for months or years at these artificially raised prices, just waiting for the sucker to come along and pay it.