I always used to take the bells off my bikes as a kid. Jumping ramps and riding trails made the things ‘ting’ something terrible.
I am tempted to put one of the marathon-style cowbells on my bike now though. I think the ‘why don’t you get a bell’ call from walkers is based on expectation. No way is the gentle tinkling of a bell more noticeable than the squealing of discs, rattling of a chain against the chain stays of a sub5 or the squeals of an elderly rider as he tries not to fall over at every bump.
With a bell I am concerned that I might reach the other end of the spectrum ‘why do you have to have that bell ringing in this beautiful, quiet countryside’?