Well that's why I do it, with the hope I can meet the right girl, and there's always the chance of meeting in person, depending on the chemistry, how far away they are, etc. It is just one more way to make a connection. I haven't met the right RP'er yet, but then I only just started doing it too. It's good experience at least. At least I'm practicing everything I'd say verbally, for when that time does come.
I think another reason why many don't say a lot in RP is they're using phones, and I get the feeling it's a lot harder for them to chat properly on them as opposed to a PC. But I don't know. I'd like to think they are getting into what I'm putting out. All the girls I met in chat I do it with are lees, so it makes sense they're no gonna say much. If there are expressive lees who RP then I just haven't met one yet. But I'm glad they let me do it, that's a good sign at least.