The correct number of shoes to own:

I'm not Imelda Marcos, but I think I lost count at 12..

How about snowboard and ski boots?
Ice Skates?
Snowshoes?
Water shoes?

I live where we get weather, so boots means a pair of very warm boots for winter/snow, plus a pair or rubber boots. I happen to own hip-waders too.

Then I have everyday shoes, and an old pair that I wear in the workshop.

Work boots -- with steel toe and all that. Hiking boots since the work boots are a bit too heavy for long walks.

And dress shoes.

At the moment I also happen to have a walking cast, since I broke my foot. But that's not a pair.

Fair enough. So how many and what kind of wheels do you have?
I got by with five pairs of wheels - a collapsible outdoor chair and a rigid frame superlight chair with two sets of front wheels - indoor/dancing only and indoor / light outdoor.

Alternating two shoes daily is proven to increase the usable life of those shoes in relative terms. Many advocate having at least a 3 pair rotation.

Shoes need time to remove moisture. Not only does moisture promote the growth of bacteria, but it directly damages the leather. Good shoes should be rotated, never worn two days in a row, and have cedar trees inserted. This will protect the leather and the shoe.

After 3 years, your well-maintained shoes should get resoled...