To draw potential customers, successful astrologers often develop an online presence, give interviews and write articles about the systems they use. Susan Miller's Astrology Zone website attracts an estimated 6 million visitors each month. Miller recommends writing e-books on astrological topics as a good promotional tool. Another successful astrologer, Rob Brezsny, noticed that many astrological forecasts were somewhat depressing and deterministic. His well-known "Free Will Astrology" website and email newsletter have attracted many clients, because Brezsny specializes in finding the most optimistic spin on weekly astrological trends, encouraging clients to view themselves as free agents in the universe.