Funny but not in a ha-ha way. They have misled many people.
It is likely that EE's came about for purely economic reasons, as said above - there was a market for colorful, pretty birds that layed colorful, pretty eggs, and lots of them. For a group of birds to be a breed they have to conform to a set standard, carefully devised by a group of knowledgable breeders. No matter who you buy a bird from, it should conform to that standard. A small group of birds endlessly inbred would eventually come to resemble each other quite closely, but genetically they would be a mixed up mess.
I quite like this quotation -
The Rare Breed Survival Trust defines a breed as:
"A group of animals that has been selected by humans to possess a set of inherited characteristics that distinguishes it from other animals within the same species. In case of poultry, breeds must be recognised by a governing body and accepted as a standardised breed according to British Standards. Colour variants will normally be considered as part of the same interbreeding population unless there is evidence of genetically distinct origins and these variants are not interbred".