Tabetha Berry has sold psychic readings for much of her adult life. But there is one thing she didn't see coming: the death of her cash cow.

Since 2010, the 50-year-old resident of Santa Clarita, Calif., has made 80% of her annual income selling as many as 60 psychic readings a month on eBay Inc., typically for about $15 each. Earlier this month, eBay said it will shut down sales of "metaphysical" goods such as spells, potions and other magical services on its namesake website.

The...