Excellent question.
I'll answer by comparison.
In other places on the Internet, no one seemingly tries to even respect one another, and so the posts are deleterious to other users (Muslim and non-Muslim) and also the quality is almost nonexistent except for the rare times wherein someone bothers to speak out of respect and not egoistic desire for Internet showmanship.
So, what I like about IB is that there's respect for people here and people do not try to tear one another down, which btw is a weird phenomena in which you'll see many persons on the Internet partake. Respect is such a small thing, but it makes people to feel in their hearts comfortable and happy. So, that's why I like IB.
Plus, how likely is that a person is going to read a beneficial thread on other boards? I'm guessing not much occasion unless a person himself/herself takes the initiative to do so in a particularized section. On IB, there's rarely, if ever, an occasion in which I do not encounter one beneficial thread. Look, for example, right now at the IB Board latest showings in the shout-out box: "Beautiful Quotes, Proverbs, Sayings," "Hadeeth of the Day," and "Ayat of the Day."
:wa: