Glass businesses make money by creating and selling glass products such as windows, vases, mirrors, or figurines. They may also provide glass repair services or offer custom glass design. For example, an antique glass business could target customers looking to add a unique, vintage touch to their home décor. The business could specialize in creating custom stained glass windows or restoring antique glass vases. By offering quality products and services, the business can stand out from the competition and generate a steady stream of income.