Where do you think people would love to go more enthusiastically, museums that have a entry fee or the other where anybody can walk-in for free? In my opinion, people are more attracted and excited to go to a place when they are paying for it. Although, paid museums are out of reach for many people, but definitely it is worth paying some money when you get an organized space, easy dispersal and a voice guide. Moreove, it also increases tourism.