The reason that people do not care or have any interest in the Commonwealth Games is that there is only a solid handful or maybe two countries who are solid contenders as far as garnering medals. The Commonwealth Games are between the countries that are a part of the Commonwealth of Nations. Countries such as Canada, Australia, England, India, and New Zealand are the ones who always have high medal counts when they compete in the Commonwealth Games. There are only a few athletes that compete at the Commonwealth Games that people from around the world would recognize or even ever heard of them.
That is due to those same elite athletes competing in the regular Olympic Games. Several of these countries are known all throughout the world for particular sports like New Zealand in rugby and Jamaica when it comes to track and field. Other than that not many people have heard of athletes competing in the Commonwealth Games and that is the main reason why people don't really care about the Commonwealth Games.
It’s not that people do not care about the Commonwealth games, it's only your perception. Just because the influential American media doesn’t cover it extensively doesn’t mean the rest of the world isn’t paying attention. In fact, Commonwealth games reached its top viewership during its 2010 games in India. The 2010 games had over 6000 athletes participating, making it the largest sports event to ever take place in Asia. The image of the 2010 games has made the CommonWealth games as prestigious as the Asian games and raised the bar.
The wave that 2010 created lasted in 2014 Glasgow CommonWealth games, which is considered the best Commonwealth Games in history for its spotless organization and its ability to live up to the hype that the 2010 games had created. Commonwealth Games are a huge deal for countries in the Commonwealth as it provides a platform for athletes from second and third world countries to compete in an international event and prepares veteran athletes for the Olympics. The attendance at the 2018 games dropped but viewership, especially from India, increased twofold (making the overall future of the Commonwealth games brighter).