Batman 85th Anniversary Collection [4K UHD] [Blu-ray] [Region Free]

I love Batman, and the origins of different stories along with the incredible animation. However, these 10 movies and a booklet is not enough for the £120 price tag! I'd be happy to pay around £75, because that's what this box set is worth!There are no extras either! No special edition documentary or anything! It's incredibly disappointing and it's driven by the price why this is such a low score!