Most of the time like more the other girls than the main heroine/s... Did it ever happened to you? Why do you think that happens?
Sure, all the time.
Main Girl is like Call of Duty -- bland, wide appeal, and appealing enough to get folks to stay on board. Side girls are like niche Japanese games -- they appeal to a narrower audience but arouse intense interest and keep folks hooked. Or you can think of it like a fast food menu: you have a main, reliable dish that's inoffensive to capture the middle of the bell curve (Big Mac, Quarter Pounder, etc.), then some special dishes to to capture as much of the long tail as you can (Chicken salad and apple slices for the health-conscious mom, a breakfast menu for workers, etc.)
It's a formula that has to be used because serialized comics have to appeal to a mass market.
Main Girl is like Call of Duty -- bland, wide appeal, and appealing enough to get folks to stay on board. Side girls are like niche Japanese games -- they appeal to a narrower audience but arouse intense interest and keep folks hooked. Or you can think of it like a fast food menu: you have a main, reliable dish that's inoffensive to capture the middle of the bell curve (Big Mac, Quarter Pounder, etc.), then some special dishes to to capture as much of the long tail as you can (Chicken salad and apple slices for the health-conscious mom, a breakfast menu for workers, etc.)
It's a formula that has to be used because serialized comics have to appeal to a mass market.