That's always been my response. As a fan of Marlowe, I'd buy into the theory that he wrote the plays if it wasn't Shakespeare, but if Marlowe or Bacon were capable of writing the plays, why not Shakespeare himself?
Of course, I have always thought that Michael Faraday was actually a composite of other men. It just does not stand to reason that the son of a blacksmith who received no formal education and started out as an apprentice to a bookbinder could become the head of Chemistry at the Royal Instutution. It really was a small team of imposters who made all his electrical and chemical discoveries and gave his famous children's Christmas lectures. Or, perhaps I'm just one of many who deny the existence of true genius because of petty jealousy pr prejudice.