When researching domain names to buy, one indicator of value I look at is the number of other extensions that are or have been registered. My thinking is that if others have registered the .net, .org, .info, and other extensions with that same keyword, there are likely some immediate suiters for the .com domain name I am evaluating.
When looking at GoDaddy Auctions, the GoDaddy Appraisal is shown on each landing page. While I don’t give that value more credence than I should, it is undoubtedly one signal I look at when trying to find valuable domain names up for auction.
One observation I have made is that the GoDaddy Appraisal seems to be higher when there is more than one extension registered. Here’s a completely hypothetical example of the differences I think I noticed based on this observation: