Comment by underlipton

This is common. Most online retailers don't have the means to recover and remediate used mattresses (if it's even legal). Most are essentially just branded drop-shipping companies hocking products manufactured in Asia (often from the same factories, with minor differences between "models"). If you have the money to purchase the mattress initially, then you can just keep doing 90-day trials until you get one that the seller asks you to dispose of yourself when you try to return it. Bam, free mattress. Manufacturers and retailers can afford to do this because the markup on materials+labor+shipping is insane.

I'm surprised that people haven't caught on yet. Maybe something to do with the nature of the purchase. In a better world, even a "luxury" mattress would cost a couple hundred bucks, at most, but then be extremely difficult to return.