The basic premise of allfordomain's service is they send your domain advertisement to X number of "domain buyers".
They'll even send your domain to 150 of these "buyers" for free.
You will get several "interested parties" (fake) saying they want to buy the name, but before they will buy it they will need you to get an appraisal for the name from a site they trust (which also happens to be owned by allfordomains).
They prey on domain owners that are not privvy to their scam, suckering them into paying $40 for worthless appraisals. Stay away.