It's also very good mental exercise, since it forces you to think even more about the corner cases of the language and its syntax. Even if you won't be using all these corner cases in production code (hopefully), it will make you a better programmer.
I find that reading minified/obfuscated code really helps with spotting syntax errors and related subtle bugs in regularly formatted code. Instead of relying on cues like indentation, you begin to parse more like a compiler, and things like missing semicolons stand out.
