I prefer my beer to be clear if it's to style.
Obviously it all depends on why the beer is cloudy, if anything can be done to clear it, how much work it will take to clear it, etc. If I know from experience that the beer will clear if it sits for another month in the secondary then I will do it. If it means that I have to cold crash the beer, I will do it. If it means cartridge filtering the beer, hell no. I have extensive experience using cartridge filters on beers and ciders and it has just added another layer of annoyance that is not worth the time, effort, or money.
For me it's a lot like mowing the lawn. I could just go out there and trim the grass down and be done with it. But then there's the sprouts that stick up near the garden, the sidewalk, the curb, the AC unit, the trees, etc. If I'm out there I might as well break out the weed-whacker and trim things up a bit. Sure it might just be for looks, but why not put out the little extra effort and clear the beer?
Aside from extra effort, it also helps you develop another brewing skill. If you're the type that doesn't care if they hit the right gravity, doesn't worry about getting the right bitterness or hop aroma, doesn't care how the beer generally tastes, never cleans their beer lines, etc, then it might not matter. It might be for those who strive a bit more for perfection and an added level of complexity. Is anyone in the world going to know if I get the perfect sear on my steak? Is Emeril or Ramsay going to pop out of the sky and yell at me? Do I have a professional culinary reputation to uphold? No on all accounts. It doesn't change the fact that I have self respect and try to get the best results every time.