Definitely, It is a profitable business. However, It depends how are you reselling it and from where are you buying the services. If you are reselling the servers, you would hardly earn the income in low percentage, Instead of look for the real VPS OVZ and KVM reseller hosting plans to make VMs though your reseller panel and sell it to your clients, you can make the VMs according to the clients requirements and resources that way you will earn a lot.