Very good point. How do you know what are average strains and the better strains? In fact some strains may take five to ten years to get to the level of the top strains. Of course you can always cross strains and see if you hit the lottery or not.
What does a beginner do?
Sure glad I am not starting all over again.
Then think about the colored chickens that look so pretty in the catalogs that every buddy wants to have.
You can see why there are so few breeders left anymore. Its very tough to maintain and or upgrade a strain of fowl.
http://showbirdbid.proboards.com/thread/5893/inbreeding-serama
Here is a article I found today that hit a home run. This can apply to any breed and I thought you might enjoy reading it its a classic and that's why I be leave in getting the best stock you can then roll up your sleeves and hammer away in line breeding and or Inbreeding. Make these unwanted genes come to the surface and skim them off and in no time you will have a uniform strain of birds that look like peas in a pod.