Instead, D&D is viewed as a foundational intellectual property that needs to retain it's base to remain legitimate when they pitch it as a possible movie franchise, premium cable series, MMO, VR experience, or whatever big or next-big thing they hope to hitch it to.
I tend to agree. And that leads to the idea that they don't have a singular preferred customer.
As Corpsetaker mentions - when you create a product, you figure out who are are trying to sell it to. But the D&D RPG is one product. A comic book is another product. A computer game is another product. A major motion picture would be yet another product. Nobody should think all these diverse products necessarily target only *one* preferred customer type.
A product may have a specific target customer, but a *brand* doesn't necessarily. Brands are bigger, and have many different possible customers.