See The Lincoln MKX on AmazonI think this is a silly tactic, and one that has a real danger of back-firing. In general, Amazon allows customers to post negative reviews of products if they are reasonably written. Like any other item, it appears that users can comment on the Lincoln vehicles and give them star ratings. You can't really order a Lincoln from Amazon, and you don't save any money, which is Amazon's big draw. You also can't cross-shop other cars.
People are not going to go and email each other, "hey, did you see that new Lincoln on Amazon? $25 shipping!".