I don't really like the chime either, but I don't want my computer to play a whole jingle when I turn it on. I seldom turn off my desktop, so I don't mind much about that. I wish the laptops had no startup chime though... It's horrible when you're in quiet, public place and your MacBook makes a loud chime.
Just make sure you put the Macbook's volume at its lowest before you shut down.
I also find it quite embarrassing when I open up my MB in a seminar and it chimes.