Why do rich guys use canes?

walking canes are just as good for the wealthy as the poor, yes. they serve the same purposes.

However, I assume you mean like an elegant, show cane. Below are 2 related links, one to a selection of walking canes, the other to a blog on the history of walking canes. There you will see that the cane became a measure of a person's stature in society when guns began to replace sWords as a way of self defense. So....people carried canes instead of their sWords, which is where you get the picture of the wealthy 19th century "monopoly" guy with a cane.