It works both ways:
If the owner of the stud has never heard of the guy who's calling him asking questions ... then the stud owner doesn't need the customer.
The truth is, if any guy is at the stage of the game where he's still wondering, "What qualifies a dog to be a stud?", then he's probably not yet reached the level where he's breeding anything worth talking about in his own right ...
Typically, guys who are repeatedly and consistently breeding winners, and top-shelf dogs, automatically trust the judgement of other dogmen who themselves are repeatedly and consistently breeding winners ... precisely because of the very fact they're able to do this.
By contrast, it is typically only green blowhards, who haven't yet mastered anything, who "can't believe" and who "doubt everything" ... precisely because they themselves can't yet make anything work
Jack