At least that would make them aware that they could be missing out on second chance offers by not having the option enabled. And second chance offers can be life savers.
I bought an item through one of these second chance offers but couldn't use the paypal link from the second chance offer auction site. It kept saying that I wasn't the winner and couldn't pay for the item. I had to contact the seller and go through paypal's website. Later somebody said it was because he hadn't set it up right when he made the second chance offer.