Minimal Lisp binaries

Nearly all lisp dialects have native code compilers, and many can produce standalone executables. One thing I don't understand however is why executables require the full run-time? especially when your code doesn't use eval. Is there a way to use create a minimal image with sbcl that only includes the functions your program uses?

>>14
Maybe turn based AAA-game. Real time game would be impossible due to GC pauses. Even turn based would be hell since you'd had to wait so long between turns. GC is shit.