[wikwocket]

I would echo everyone who has said there is nothing shady or unsustainable about this. You are managing people with skill-sets to complete work of business value for customers. This is essentially how most of the world's companies run.

As for whether it is sustainable for you, you might want to get another few customers, to see if your pipeline is repeatable. You may also wish to accumulate enough savings to live on for 6-12 months. That way you'll have some runway to ramp up your rainmaking, and figure out if you want to do this for a living, or go back to a day job.