Because everybody's an expert in something, and almost everybody is poor, try MinuteBox: a just-into-beta, London-developed service that helps you "leverage your expertise, and online reputation" in order to get people to actually pay you to vid-chat about whatever it is you know so much about (hopefully, divulging it will take more time than your other webcam business).
Just sign up, and the site's own net-scouring tech will dive into your social media platforms (blogs, Twitter, Facebook, Flickr, etc.) to mine for keywords best describing your apparent qualifications (e.g., "medicine", "law", or "sports" -- these can be edited if they're off-base, or you're a con artist); then set how much you want to charge per minute, literally anywhere from a penny to a grand, calling to mind the old saying, "A grand for your thoughts? Are you f***ing kidding me?" When someone wants to buy your time, the site'll shoot you an email describing what they're after; if it's a go, their Chat App will allow you to decide when to start the timer, and instantly PayPal you after hang-up, so you won't have to buy a few minutes with a dude who claims to know a lot about debt collection.
Because a keyword bot should never be the ultimate arbiter of anything, clients are asked to leave feedback after each session rating the overall experience along with the skill level of the expert -- shaming the useless, and hopefully preventing a site where almost everybody is "poor".