If that is the case, what is the pleasure they get out of it? Porn triggers the pleasure centers that sex triggers... but astrology, what does that trigger? Sense of security that you "know" your future after reading your horoscope? Or what? Did the guy have any theory about that?
No, it's comfort in knowing that some(thing|one) else is controlling your destiny. It's not about knowing your future. It's about knowing that there exists a path you're being ushered along.
To say an astrology hotline is strictly equivalent to an orgasm is silly, but for women the circuitry is very nuanced so I wouldn't be surprised if the same neurons were firing.
Extrapolating it to anything else than that would be to read too much into an anecdote given at a diner.