But it used to be much more difficult to distribute software than it is now. Most of the money went to the publisher, I'm sure. Not that I'm aware of. David Ross are interested in creating a software company to make authoring tools and help fund the museum. That's not as easy as it sounds.
Marketing is often the most important factor in the commercial success of software.
I'd hate to see the museum's focus waver from supporting art to supporting marketing of an entirely new product. It's very complicated. To return to your question, frankly I don't know anybody who makes a living creating art that is entirely software. Two of my works that fall into that category are Every Icon and Color Balance. The Web to me appeared to be a viewing platform for software ideas.