I don't know what kinds of 'tools' you used, but perhaps this is your problem :talk: I hope we are not talking about estibot and that kind of stuff...
A tool cannot teach you what makes a domain valuable - you have to learn for yourself.
If you think the domain is good, you don't care about the appraisals.
Now it all depends on your intentions. If you buy a domain to develop it, it doesn't matter if the domain has no resale value since you are going to develop it. If on the other hand you buy domains to resell them - then you need to do research, read, learn and be patient. You don't become efficient in this business in 3 days.