Games, TV, Movies, other media that have digital artwork, all can render within a High Dynamic Range. If you produce artwork for those media, you would likely want to be able to match the capabilities.
There aren't yet that many people using HDR screens. Even 4K is still kind of a niche in most parts of the world as most people don't replace their TV more than once every 10-15 years and when it breaks they aren't necessarily ready to pay a premium for a quality they haven't experienced yet.
It is always the same issue. Why buying better stuff if there is no content and why make content if there are so few users? [1]
[1] the answer is porn.