Do a lot of people do this? Is it recommended to do it "per season"?
What are the downsides? Say 2-3 identical pairs for each type of shoe.
*Inspired by thread regarding Ravenna 5s.
I loved the Kinvara 1, and I bought a bunch of pairs for $30 - $40 each. They last ok until my last pair, which I just threw out last month. At that point, they had dry-rotted and the glue deteriorated so that the sole was starting to separate before I used them. I got under 300 miles before they literally fell to pieces.
For two years? Yes, they were fine. For six or seven years? No.
I buy two at a time, but sometimes up to 4 if the price is right.
I've found that the more I use a single model, the faster they wear out. For instance, I can get 475 miles on the first pair. But the 3rd or 4th, I can get closer to 400.