The sluggish market situation why vending machines are still popular?

Current market diversification, vending machine appear above are selling snacks, drinks, adult products, sex toys, etc. In recent years the Internet of things is also slowly infiltrated the vending machine industry, also brought more convenient shopping experience for consumers, many for the slightly investors interested in the industry, has set his sights on no one sells on the market, so why are vending machines with such attractive? Vending machines upfront investment amount is not as high as the threshold of the other industries, relatively operators to early capital requirement is not so high demand, early if you want to open stores, storefront rent, shop decoration, collection of these fees are more than 5 to 100000, and is the common decorate. Many people still cannot afford the price. If you want to pass the vending machines to sell these snacks, drinks, the early stage of the common enough, and there is no risk. Vending machine itself has advertising business promotion value, when you run enough scale, will be able to charge extra through vending machines ads, can do brand video promotion for other businesses, let more consumers know business brand, this also is a kind of advertising sales model, two-way to make money.