Regeneration is everywhere!

I've been thinking a lot about the Doctor and his regenerations, and I've also been thinking a lot about Betty Crocker, because of this 60's dinner party I'm throwing next weekend. This morning as I was waking up, it suddenly occurred to me that people shouldn't be so surprised that the Doctor can regenerate, because Betty Crocker has regenerated many times. (The 1972 version is the "real" Betty Crocker to me, just like the 5th Doctor is the "real" one as well.) So has the Morton Salt Girl, the Downy baby, and many other advertising slogans. If those fictional characters can totally change their appearance and we don't bat an eye, why shouldn't the Doctor?