> OSX's base install does contain any C compilers, it's in the Xcode install.
I think you ment to say "Doesn't" instead of does. This nullifies any argument that GCC and the Gnu Toolchain are free to download, if in a year from now the OS you buy doesn't contain GCC in the base install in order to download and compile GCC.
Yes. Because Xcode has been free for 10 years it's taken for granted that Xcode is free, and because OSX's base install does contain any C compilers, it's in the Xcode install.