Motorola RAZR V3c

This may be a dumb question, but why is everyone so concerned about vibrate and ring at the same time? I have my phone ring when I'm at home or in a place where I don't care if it makes noise, and I put it on vibrate (or silent or off) when I'm at work, the movies, etc. I just don't understand why I'd ever want both at the same time. Not knocking anybody who likes it that way, just trying to understand why it's such a popular feature people are returning their RAZRs because it can't seem to do it. Maybe I'm missing something! Thanks...