Yes, it has more of an association with Harleys and the cruiser crowd I believe.
Just like "good luck charms" or St. Christopher medals, many folks believe it does something. It is not really my cup of tea but historically, bells have often had an association with religions and with good spirts. In both western and eastern religions bells are associated with the "good" side of things. In several Buddhist temples in Thailand, there are many large bells lined up. One says a prayer and taps the bell to aid in sending one's prayers. Being a percussionist, I love metallophones of all kinds including bells. Bells and gongs are some of the oldest instruments mankind has devised. They are fascinating devices. Making them and tuning them is a real science. But, good luck and guardianship? That is up to the individual...I just like their sounds and the physics behind them. I have hundreds of them as well as their related instruments (chimes, glockenspiel, vibraphone, crotales, cymbals, etc.)
Aren't you sorry you asked? Haha!