What women do you know personally that have their own webcam? Does your sister have an X-rated webcam? Does you mother have an X-rated webcam? Then what makes you think that someone else's sister or mother would have an X-rated webcam, unless they knew it could turn a profit? The closest thing to a webcam that women run for free are shitty vlogs where they share their feelings and favorite recipes. Think about how hard you have to work to convince a girl to send you a sexy selfie, let along a video.
A handy rhyme we use around the office: "Invite to a webcam means it's a web-sham."