Too many customers obviously won't increase your profit, and if you're selling things at a loss to them, I don't think that's a good way to attract more customers. Instead, treat your customers well and stock your store with a variety of goods so they can make the perfect choice when they visit. As you mentioned, treating your customers like kings is another great way to boost your revenue because they'll notice when things are going well in your store.
by providing a high quality of service and also food you provide can surely attract more customers especially when give them satisfaction of what they really want, the consumers will always come back when you treat them right and make them feel welcome as your regular customer and that's the time they will give feedbacks which it will give a very big impact for your establishment to be well-known.