It is important to have some extra services for higher-tier customers. For example, you can add 6 months or more guarantee and also ask for extra payment for it that may involve faster delivery services. Extra services for additional services are like side dishes for your main course. Most of the restaurants’ profits come from side dishes as well as the drinks. It’s the same for your products as well. Moreover, for the additional services, you do not need to spend much effort as the main product you are offering. So, this is a very profitable option as they won’t cost you much time or money.