If you spend enough time around small business owners, you start to notice a pattern. The businesses quietly making serious money are rarely flashy. They are not trendy apps or viral startups. They are simple, repetitive, and often a little dirty. In a recent Reddit discussion, hundreds of entrepreneurs shared real-world examples of what they called “boring” businesses that quietly print cash because demand is steady and operations are straightforward. Don't Miss: Bad Ads Live Forever — See How