They are not going after the HN crowd.

They are going after professionals who have been spoiled by commercial Lisp implementations for years and decades now.

I doubt that Clojure is going anywhere with that demographic.

And I'm absolutely certain that the existing Clojure audience wouldn't shell out a few thousand dollars.

Especially since Lispworks is building a language implementation and ecosystem (KnowledgeWorks, CommonSQL, CLIM) where the IDE is just a relatively minor component.