I know people who write really low quality populist fiction on the Amazon Kindle store and bring in over $3k/month. Over time, the old books still sell, so you

I know people who write really low quality populist fiction on the Amazon Kindle store and bring in over $3k/month. Over time, the old books still sell, so you have recurring revenue that gets compounded as time goes on. There are other examples, but that's the easiest to understand.