Sell outcomes not time. In a billable business culture, this can be challenging.
If somebody gives you something, there is the possibly that they can take it back. As a lawyer, it is called employment at will. When you have your own clients, the clients belong to you.
When you rent or lease something, it's usually cheaper in the short run and more expensive in the long run. When you own something, it's usually more expensive in the short run and cheaper in the long run.
The difference is equity buildup.