"I would have serious doubts about the professionalism of a candidate sending through a CV in RTF."

I find that shocking, and indicative of a lack of professionalism on your part. Why would you arrive at the conclusion that a format that is more stable, more performant, more portable, more secure, and less prone to problems of all descriptions is a sign that someone is somehow less professional?

"As a recruiter . . ."

Oh, that's why.