You're using free credit and then use their API to resell? I mean how could it be profitable If you're going to sell at the same price?
Regardless though, you will have to compete with both Bithost.io and BitLaunch. I suggest checking at their prices first. If you're not offering something new or competitive rates, there is no reason for people to use a new service.
I am planning just to add a small commission but still have lower prices than bithost. Bitlaunch seems to have really high prices. I am also planning to add windows as an option on the server.