I wouldn't say that I only dress to please others, quite often I dress to please my own vanity as well.
Anyway a hi or hello is very common and it doesn't stick out in the least so it rarely catches my attention. A witty comment or something of the sort is much more likely to catch my attention and make me interested in actually talking some to the person.
However, a lot of people, even those that had a good way to get my attention often end up way short... and that's because in the next few messages they'll ask me to room with them. I mostly decline those requests at once, I'm rarely interested in rooming right of the bat and definitely not with someone I don't know at all.
To really break the ice and get me interested is if I get the feeling that there is some sexual tension with whom I'm chatting with and not just a one sided desire to get off. But of course that's quite picky so I mostly end up only chatting when I'm online, I'm perfectly fine with that myself but I guess there are many who primarily want to get off when they log on.
I guess that what I want to say is that even though you might get a response, or more, the conversation can die very quickly if you're looking for different things.