I'm not sure that turning off friend requests is a good idea, at least not completely. I get hammered by people all the time. My record was over 95 requests in a day, maybe six hours or so. When I ride the dark rides, I can count on 10 -15 per riding session, and hour or so. God help me if I go into a trade room! (which is why you will rarely find me in one)
Having said that, one of the main things to do in VMK is to make friends. It's even on the VMK Values page as something we should do. How can new people, or shy people, make new friends if they can't ask? Aren't those of us on the DIS more willing to help others? Difficult to feel helped if no friend requests are accepted by many around you.
Maybe because I'm a CL I feel more obligated to accept friend requests, when I can. I have to delete ppl from my lists after they haven't been on for three weeks or so, unless it's someone that I know is taking a sabbatical. I have to do this to make room for the newbies. It would be awful for new people to click on someone they've been talking with only to find out the person won't accept friend requests.
But if you did turn them off, the person could ask. Then you are in the awkward position of having to say, "send a request and I'll sort it out later," which seems to be my mantra most days.
I don't know. I see both sides. God knows I don't like to be pummeled with requests. But I'd hate for new people to be turned away left and right.