We are here to guide you how can make more profit by pitching srvices optimally.
We suggest you to please focus on services which can offer you high rate of return. Courier service can make you a profit of £5-£15 on an average courier transaction. Same way, mobile unlocking can make £2-£5 profit on an average transaction. You should focus on these services even more.
On top of this, you can change customer's price as per your choice in courier, unlocking and international top up services, but please make sure to charge customer competetively, to eastablish a long term relationship with customer.
Few products are kept in product portfolio just to increase customer footfall. Please consider top up service as a product which can bring customers to your business place. Once customer visits you business, try to promote other services too which can generate higher profit.
Below is some data to explain how profit varies from service to service.