Like a friendship, you slowly open up to one another depending upon how comfortable you are. Many of the models I became regulars in learned more about me than I did about them. While certain levels of privacy were maintained, it was still a little lopsided. Personally, I'm fine with it. I respect their privacy, and accepted what they were willing to share. Some were very open and honest about their lives. Others, much more reclusive. I was thankful for them trusting me enough to tell me what they did.
On the flip side, if I'm in on an actual dating site (not a camsite), or talking to someone where there's an interest in pursuing a relationship. Then, if someone asks a question, they should be willing to answer it as well. I've had it where more than a few times I'm in a conversation with a gal and she's prying for info but not giving anything up in return. Again, I get there's a certain level of security required in early stages of relationships. So, I don't have a problem with guarded answers. But, if you're not willing to answer your own questions, why are you even there in the first place?