Zelot, you're not a random guy who came to this server yesterday, or 2 days ago. You've been here long enough to make me sure that you pretty well know the answer to your own question. But I guess, you're asking that just to hear my opinion about it.
One can answer to your question with one sentence: "Simply because you can dock anytime." Let me explain this more precisely. The fact that you can dock any time you decide affects our RP quite much. It affects the effort from our side to put in our RP, simply because it might be a waste of words, and you dock in the middle of conversation. It affects the time, as we might waste time for the same reason. It affects our expectation for the same reason, as we're not sure if I start a different RP which demands more time and effort you will stay, don't dock and listen us till the end. The most important thing is that whatever RP my character would play there, it would end with a demand from my side, and a dock from your side, which is a big fail. The thing isn't about you docking after we state our demand, but the thing is getting refused while you're not able to do anything, but sit still and read the docking msg.
But what really disappointed me from your reply to my post is that you simply ignored the most important part of my post and all of your attention to the part which was actually secondary important. It makes me think that you simply tried to find a "word" in my post, and pressure that "word".
I'll repeat myself, diversity makes everything more interesting, and most of you fail to understand that. If you expect banal RP lines from us, we can all simply set pirating lines as setmsgs and in less than a minute you'd hear a demand from us.