Handling has always had positive results with mine. Only Roosters/Cockerels that won't tame down is a Man Fighter. Those are genetically human aggressive.We are getting great prices for roosters here at the livestock auction, but no one is concerned about if someone handled them or not.
As far as someone caring about if they were handled with the intention of keeping them in a backyard flock, sorry not going to make them worth more. Some people even think that causes them to be aggressive (I don't agree)