In my observation, racing games aren't as popular as FPS and other games due to a few key reasons. Firstly, they often lack the interactive multiplayer experiences that games in other genres provide, making them less social and immersive. Secondly, the repetitive nature of racing games - simply going around tracks - can be less engaging compared to the diverse scenarios found in FPS games. Also, they typically require specific hardware like racing wheels for the best experience, which is an added cost. Lastly, the learning curve can be steep and off-putting for casual gamers.