There is some relation to the weight of the bikes. The lighter they are the less is the probability the carry a bell/ring.My wife and I walk. A lot. What really pisses me off are cyclists who don't own or use the bell on their bikes on shared walking/cycling tracks.
More than once I have been tempted to shove a stick in the spokes as they fang past.
At the least I tend to give them some obscene vernacular.
It’s self absorbed idiocy (I do not really know whether this translation works)
They are so proud that the have the light and sporty bike that the think they are light and sporty extreme sportsmen who have the damn right to do their own thing.