It was about content 

There is a lot of content in those photos and I give a heads-up about the commercial nature of the site for those who might feel that they will not be able to resist the offer for sale of the images.  Those images have a lot of content in them and you are being a hair-splitter by ripping them out just because copies of them are for sale.  To do shun all art museums that have a shop atteached to them? Get a life: I am putting that link back.