If you don't give them enough information to make a decision as to whether or not they should respond to your response, they will have to guess whether or not they think the two of you will get along. Most of the time they will decide not to respond because they see potential problems from your being so secretive. That may not be your intention but that's their response. Let's back up a few steps. Let's start by looking at why people place personal ads.
People place a personal ad because they are looking for something.
They have a problem they believe a relationship, on some level, will solve. The problem could be loneliness, the need for friendship, companionship, sex, romance, love, marriage and children. They, too, are looking for something. They have the exact same set of problems as the advertisers in personal ads. They have the same set of needs, wants and desires, too.