Sure, but it's far easier to market nice visuals. You can make posters, screenshots on websites, magazines or make nicely cut videos. Physics would be far better appreciated by anyone playing the game, when the sale has already occurred. And if you want to market it, you'd probably need to make a commented video showcasing how is your solution better. And I don't believe such video can have the same interest as some trailer with just nice visuals. Personally though, I would far more prefer better AI, than physics or visuals. Some modern games have embarrassing AI, e.g. there are memes about TES games, where you shoot an arrow in some guy's head, they start looking for you and then stop and say "must be the wind", while the arrow is still sticking from their left eye. But marketing AI is again far more difficult than nice visuals.