Being part of an open market is a problem; you'll forever be battling the forces of demand and supply outside of your control. Having a market of your own is the key to becoming oversubscribed.
CREATE YOUR OWN MARKET
Let's take a look at actors in the US as an example of an industry in oversupply. There are more than 160,000 people who have a Screen Actors Guild (Screen Actors Guild – American Federation of Television and Radio Artists) membership and there are barely 3,000 actors who make better than minimum wage from their acting income. About 99% of actors can't afford to live on the money they earn from acting. Fewer than 1,000 actors in the US make over $150,000 a year.