If you strip down a language so far that there's not much to it at all, then $1000 for a new language isn't so far fetched. Just don't ask for support for libraries, a JIT VM, etc. Then again, you could implement it on top of a pre-existing VM, and get access to libraries.

What about a minimalist subset of Python with curly braces instead of indenting? I think I'd actually like that language. Add an easy mapping to Python libraries, and you're done. $1000 is still a bit on the low end for that, but $3000 would seem quite reasonable.