Yeah, but the HK SP5K doesn't come with a brace. Nor a 3-lug barrel. Granted, you can throw a brace on a PTR 9kt and still be ahead of the game; but the PTR doesn't use original HK MP5 parts.
So, I don't see the price as outrageous.
But, as a general rule, I don't buy clones if there is an available real-deal HK offering.