Most Astrologers not advertising on Google Adwords

Though astrologers are advertising extensively in newspapers and magazines, it is observed that there is almost no indian astrologer who is advertising using Google adwords
For almost all services, Google has plenty of advertisers, only for horoscopes there are no advertisers
It would be interesting to find out why the astrologers do not prefer Adwords
They are charging high fees and are extremely wealthy
Only for a search of Rajat Nayar, his ad is appearing at the bottom of the page