it's convient and quicker. saves the paint as said, but it also unlocks both doors so the passenger doesn't have to stand around waiting for you to unlock your door, get in, and flip the power lock button. not to mention it's safer, so someone can't just jimmy open the door.
as for the beep, you may as well bitch and whine about birds chirping or walking by people playing music you hate. there's nothing you can do about it, why spend time even bothering with the frustration, you're not going to live very long if you stress about pet peeves. it's a quick beep beep that takes maybe a second of your life, get the hell over it, there are more annoying and troubling things in life than a man's car alarm. i don't think anyone thinks they're pimp because they can make a beep beep sound with a push of a button, i doubt anyone's doing it to be cool. sometimes i'll walk half a block away before arming mine to test the range on it. i actually have a silent arm on my alarm as well.