Most other places, it's likely to be the first uncertain step down a very slippery slope. It's more a question of how a sales link influences which performances critics will review. The Times and other major newspapers have institutional safeguards against this. Their review schedules are set without much regard for how well CDs are likely to sell on their Web sites. At other sites, such safeguards are less well established.
Most newspapers review only a few CDs.
How their review schedules are drawn is perhaps just as important as what their critics will say. Look at the question again and you'll even see a potential new market springing up. Your friendly corporate ad people would never think of forcing you to review Wayne Newton. You can still review exactly what you want. They'll just buy a syndicated review of Wayne's new album and put it next to the link.