The thing is, 99.999% of people have absolutely no idea what this red dot, black dot stuff means. Personally, I always thought it was excess paranoia to worry about the dot since no one I ever met cared. But some camera owners apparently do.
Only once in my entire life did anyone remark on a Leica camera I owned, and that was actually an R body (R5 w/ an R 90 Summicron, and that sure was a fine lens). That camera had L E I C A written on it in big letters, so that alone, red dot or no, was like an advertisement. The gentleman that commented on it happened to teach a photography course at a local college, and his comment was more about running around w/ a $1200 set up slung over my shoulder than the perceived status or quality. For what it's worth, that thing had some serious shutter lag, along w/ a mirror that went "whomp", so when I finally gave up on R bodies and put my Summicron on a $20 Nikon N8008s, my keeper hit rate improved dramatically by getting away from a Leica camera.