A study revealed that generic domain names within online ads got significantly more clicks than branded names.
The results of this experiment make sense. When consumers are searching for a product, they will likely be more inclined to click on the domain that most closely matches that product. Judging by the study (bearing in mind this is one experiment), businesses that do not have an instantly recognizable brand name, like Amazon.com, might consider buying domains for individual product campaigns. Start with some keyword research, and then try to find the closest matching available domain name. The traffic can be redirected, or a very specific landing/checkout page can be built.