The same reason(s) any consumer product ends up on the used market.
I was able to find a set of 285/65/18 KO2s with less than 5k miles on them with these black tundra trd wheels for $700 on craigslist a month ago. The next day I sold the wheels (not the tires, just wheels) for $600, took the KO2s to Discount Tire and had them replaced under warranty due to the cracks ($200 prorated), and even had them agree to replace them with my preferred 275/70/18 size. All things considered, I spent roughly $300 on BRAND NEW 275/70/18 KO2s with full warranty.
View attachment 1390996