Keeping Koi is a very expensive hobby. You need a good and big pond to keep them if you want your koi to grow to a huge size and healthily. The value of Koi depend on the colour of the fishes. The price can vary from a few dollars to thousands of dollars.
The kois you see here are not worth much because their colours are not very pretty but then I love them as much. Seeing them so huge and swimming about minding their own business is a joy.
But alas these Kois dont belong to me. The only koi in my home is the koi mould which I used to make "agar agar"....hahaha. You can view them in my food blog