This message from a year ago is still valid.
Having been to MFC on and off for a number of years now, things have changed over time. In the past, the models seemed to be much more open to the "social network" aspect of the site. They would log on and hang out, chat, and answer pms if you tipped to get on their friends list. Offline, they would answer MFC Mail. As things have evolved, a lot of the models have gotten more jaded, don't answer pms or MFC Mail (even if you tipped to get on their friends list), and the general vibe they give off is, "tip me or shut up".
The way I used to do things was to chat with a model for a while before taking her private, get to know each other a little bit, establish a connection, some flirtation. Most won't even take the time to do that now. You chat with them for five seconds and all they do is badger you to tip them or take them private, or if they're more popular, they just ignore you unless you tip them. If they're doing public shows, all they do is complain if somebody doesn't tip them for five seconds, when they used to chill out and be patient, and chat while waiting for the topic to be completed.
It used to be something different, where you could hang out and socialize in addition to the nudity aspect, but over time it feels more and more like going to a strip club. If you want something done, tip, otherwise shut up and keep your distance. That vibe comes from a lot of the models. I would think it was just me, but I've observed it with models I've never spoken to and other members. It's almost across the board.
Having more models competing with each other as the site has grown probably has some effect, and maybe that has led to a worse attitude by many. But it all seems a lot more blunt and matter-of-fact now. "I'm not here to chat or be your friend, I'm here to take my bra off when you tip me. Now shut up and quit trying to start a conversation". Questions like, "how was your day?" just get an annoyed response. That vibe definitely comes from a lot more models than it used to, from the get-go when you first talk to them.