Just the opposite. In most cases the Architect already has the client it’s provided as a tool for the client and a tool for the design process, the fact that these materials are used to gain further clients comes after the fact as Architects won’t generate a promotional fictitious project in order to gain more clients. They will however generate viz materials if they are competing for a job, size of the project = budget to generate materials. CG Archviz studios on the other hand do this all the time, different business though. If it’s for a developer most of the time that would be outsourced to a viz firm unless the Architect supplies the developer with something already generated in house.
In this day and age everyone cares about cost, the days of unlimited budgets are long gone.
'This is where you win by having a superior product which is based on superior tools, not on a free engine which everyone in China and India will be using for games and archiviz in a matter of few years."
There are very few projects that are large enough in scale to warrant that. If you’re a viz firm with those tools you’ll still be competing with low cost labor especially in the Architecture world as I mentioned the viz materials are considered overhead in most cases.