hi christmasinjuly,
this is an interesting post title because, like it or not, everyone is susceptible to flattery in one form or another. astrology gives us information about the basic personality of a zodiac sign that we wish to impress, that gives us an "edge".
for example, virgos are known for being "picky" and health-minded, so, a compliment like "what a neat house you have", or "what do you do to stay so healthy?", will surely make points.