All hobbiests are not the same. For some the hobby extends no further than their own backyard and for them any Koi they find attractive is fine

. Nothing wrong with that. Get the most attractive fish you can reasonably afford and smile all day long.
For others Competition grade Koi are the only ones they are interested in either because they enjoy the competition or because they are in love with the Japanes art form of Koi

.
And then there are the suckers who will pay big money for crappy fish just because they are from Japan

. They wouldn't know a great Koi from a common goldfish

, but they think an expensive import makes them important.