The CEO of the company I work for pushes for that kind of selling. I stopped trying to sell that way after the third or fourth time it left me with either egg on my face or a deal we lost money on because we had to hire a subcontractor.

Had to have a conversation with the CEO about it once, said I figured it was better for us to potentially run out of work and waste payroll than to waste time and payroll trying to do something we knew we couldn't do and have to pay someone else to do it for us, while keeping the liability for ourselves.