Thank you for your answer, Neal. I didn't really think about this until now and all the time, I've been changing BuildArch: noarch to BuildArch:x86_64 because that seemed like the easiest. Then I thought, I didn't need to change them ... I only need to tell .rpmrc what they should be.
However, in thinking (ohhh that's really bad!) along this line, wouldn't it be moot to even have i386 or even i486 on .rpmrc, and much more on the specfile?