You are right marc,
The reasons for OpenGL's advantage in the professional market is partly historical. Many professional graphics applications (for example, Softimage|3D, Alias PowerAnimator) were originally written in IRIS GL for high-end SGI workstations, then ported to OpenGL. Even long after SGI ceased to dominate the market, many professional graphics cards only supported OpenGL.
The many extra features of OpenGL that were previously mentioned as not useful for game development are also a factor in OpenGL's professional market advantage, because many of them are useful in professional applications.
The other reason for OpenGL's advantage is marketing and design. DirectX is a set of APIs that were not marketed towards professional graphics applications. Indeed, they were not even designed with those applications in mind. DirectX was an API designed for low-level, high-performance hardware access for the purpose of game development. OpenGL is a much more general purpose 3D API, so it provides features that aren't necessarily exclusive towards any particular kind of user.
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