[ApolloFortyNine]

>Shouldn't it be the seller's obligation to give a reasonable lifetime estimate?

Not sure how you define this or maintain it. These socks are guaranteed for 100 wears? Can't count wears. These socks last a year. Is that daily wear? One of 10 pairs? Only air dried? Was the user running daily marathons?

You can extend this to pretty much every product.

>last for five years of regular use.

What's regular use?