Dont know about others but I carry my main knife on my belt and a second smaller knife around my neck on a paracord loop. Its just nice to have options and as of yet I have yet to find my preferred method. Also it depends on the size of knife as the smaller ones tend to lend themselves to neck carry over belt carry. I only neck carry when I have a coat on as I cannot stand it flapping around when I bend over to pick something up. So I guess neck carrying for me is mainly a summer time choice.
Greg
Greg