Why dont they keep the old version for affiliates to promote?

It would seem to me that no matter how much a paysite is redesigned, one tour will always sell better than another for some of their affiliates, you'd figure it would make sense to keep the older and newer version online so that affiliates can actually choose which tour to send their traffic to.

Your thoughts, when a paysite owner redesigns their site, would you rather they kept the old version of the tour online for affiliates to be able to send traffic to in case the 'new' version didnt sell as well for you?

Regards,

Lee