Realistically, there needs to be a pretty big incentive for developers to go through the arduous process of achieving Linux compatibility. That means charging Linux users more substantially more. Of course, that shrinks the pool of potential customers even more. Sure the purchasing power of the average Linux user blows the average windows user out of the water, but the willingness to actually purchase anything is dramatically lower.
Or, you can just make it so that the developer needs to do no extra work to maker their game Linux compatible. Option 2 is much, much better.
Or, you can just make it so that the developer needs to do no extra work to maker their game Linux compatible. Option 2 is much, much better.