They are lonely and desperate for any kind of interaction with another human. Because sex work is illegal and dangerous, it creates a market for this kind of stuff. It’s sad. People need attention, touch, and love from other humans as much as they need food and water. But many people are unattractive and/or socially inept… but do have some money. And society is largely cruel and heartless towards outsiders. It’s hard for most to accept, but many factors outside of a person’s control can force them into a lonely life of rejection and non-acceptance by average folks. People find all kinds of things to fill these voids. Paying cam models is just one of many coping mechanisms, and maybe not as self-destructive as drugs, booze, food, etc.