Of course, the more popular language, the higher the value. $200k for a clojure IDE is certainly overvalued for the number of people using it, but $300k is way undervalued for python. Not sure about javascript; obviously it's popular, but it's unclear whether this ide supports anything but niche (non-browser) use.
Depending on how its Clojure support is implemented, LightTable may be usable for ClojureScript projects, and thus allow developers to target browsers and NodeJS (and other JS runtimes).
Do a search for "Pluggable Backend Infrastructure for ClojureScript, and Development of a Lua backend" and you should turn up a Google Summer of Code 2012 project which seeks to broaden the scope of the ClojureScript compiler. If that project is successful, and if LightTable supports ClojureScript, the IDE's reach may be greatly expanded in the relatively near term.
