This discussion caught my attention, because, although I seldom find a roleplay to mingle in with, the ones that I have joined are like you described. People are just too focused solely on themselves and their perspective of what they are doing. It is irritating to oversee it, or to maintain an assembled, group-oriented roleplay. People need to learn to roleplay with consideration for other characters and interact. Isn't that why they joined a group roleplay to begin with? And, in the fellow roleplayer's position, it must be outright troublesome to type an extended, hard written post to have it just be ignored by any other roleplayer. Yet, not every post should be responded to.
Great discussion and I hope I am making sense.