As well as an opt-in box where they are asked for their email address so that they can notified/contacted when the product is available again to purchase.
Obviously during the launch this would have created a huge amount of affiliate links posted all over the Internet.
Affiliate links which are cookied so that the affiliate still receives their commissions even if the customer doesn't purchase straight away
It seems to me like these product vendors are closing the sales page until the cookies expire and then sending a bulk email to all of their subscribers when they re open so that the customer then purchases through their own payment button and they don't lose any money by having to pay affiliates
Would I be right? If so I think this is a bit of a sneaky and unfair thing to do and I won't be promoting any products that do this just so they can receive 100% of the sales from customers that I've sent them, If I'm wrong then I apologize.