Why should people play soccer?
It depends on the person, some people play it for the fun of the game and some people play it to stay in shape.
Over 3.5 billion people enjoy soccer world wide, though that is an estimate from a few different sources. This is not saying that these 3.5 billion people play soccer, but they do have an interest in it, whether it be playing or watching it. I don't know what this soccer is but a lot of people play football.