Ugh,Venice; wow, Art department store!

Usually department stores or malls displayed what is popular and what is hot for consumers to buy. Do International Biennales like as Venice Biennale function as department stores for art? Do curators in such exhibtions pick what is popular art or who is the hot artist in different countries? Some people only believe in products selected and guaranteed by the department store system, while others don't. Similarly, some people only believe in Arts selected and guaranteed by famous curators, while others don't. I am usually the latter.