For a hundred million reasons... depends on the thing and the person. Yesterday I bought a candle... why? because I like that particular scent all over my house and I like to burn and melt things ! ... see? It could be anything ! ^^

So they can play with them.

Well there are two main reasons that I can think of: needs and wants. People buy things because they need them. There are also things that human beings cannot live without (food, clothing, shelter etc). Oftentimes though, people buy things simply because they want them. Needs and wants vary depending on the situation or status of the person.

Well, people buy things for several reasons. When they truly need some buying of some itens, eg foodstuffs. Others buy something to give to others. But unfortunately there are people who buy things they do not need.

too many reasons to say...