Writing your own OS/Browser/Editor/etc

Its like building your own home. It sure feels like you're in control but the effort wasted is not comparable with the little effect(low popularity, less use cases). People who dedicate their entire life to a software project as a hobby/work/noble cause are a different matter.
The idea of writing X because you don't like Y is just silly - you really want to dedicate all your life to maintaining and improving a piece of software, just because you're incapable of dealing with flaws in existing software?

>>13
I'm just fucking around with pre-processor and looking at the resulta, nothing really serious or useful. C preprocessor is not an acceptable Lisp. what are you switching to? lithp macros? m4? something completely unrelated?