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These pics show us buyers the actual treadwear and IF there's any camber wear, which is important.
I'm sure you know that a lot of people on CL are visual, and pics always help with the sale of items such as tires because what you may think is "normal wear" or see as "70% tread remaining" may not be the same as what myself or others would say about the same tires. Pics just help buyers feel more confident in making a purchase because they have a better idea what condition the item is in prior to paying for it.