Seriously, it's the girls who bring what Bakarina needs in life: gardening, doujin and food.
What do the boys in her harem offer? Zilch. The fiance wants her around because he finds her interesting, a spice for his boring life. Her adopted brother is an obnoxious obsessive siscon who does all he could to cockblock the fiance. Alan plays music that she appreciates but doesn't care that much, and the emotionally stunted Nicole is nothing more than eye candy. Waste of space, those boys are.
One wonders how such sublimate madness was achieved. Hard to see it happening accidentally, there's at least 10 twists in that braid, and it looks like a tightly-woven braid. Probably Madoka wanted it and then Homura (unwillingly) obliged. And I have to say, I never expected simple hair silhouettes to look so good. They look cute.
Is there a reason Mahiru gets shipped with them so often? At least in the western fandom? I haven't watched the last two anime episodes, so if there's spoilers there would appreciate nothing spoilery.