From Longman Dictionary of Contemporary Englishthere’s money (to be made) in somethingthere’s money (to be made) in somethingspokenBBBF used to say that you can earn a lot of money from doing a particular job or type of business There’s a lot of money in sport these days. Teaching can be very rewarding, but there’s no money in it. → money
Examples from the Corpus
there’s money (to be made) in something• Experts and city officials agree there's money to be made in the casino business.• And there's money in being the best.• And there's money in it.• I love airline food and further suspect that there's money in it somewhere. 