The "Quadro" (nVidia) and "FirePro" (ATI/AMD) cards are workstation-class cards, intended for professional use and optimized for things like Adobe Creative Studio. They are not optimized towards the demands of games. ATI/AMD & nVidia's consumer- and enthusiast- grade hardware are optimized towards games, however.
In general, you'll find that workstation and server class hardware is optimized for a different set of use cases and marketed towards different classes of user. Purchasing it to play games on is likely to be a waste of money. This would be like buying an 18-wheeler to drive to work in - you're probably not using the cargo capacity, and it's not going to be the fastest or most fuel efficient way to travel.
For instance, most professional grade hardware (graphics included) you'll see more use of ECC memory, as accuracy is key. In gaming, you're going to see larger quantities of more inexpensive and faster chips, since low cost and speed are key. Included in the cost of professional cards are expensive certifications, where the drivers and hardware are run through vendor-specific tests in order to ensure compatibility.