From purely engineering, manufacturing side, maybe, but you often have pay more than just the manufacturing cost. The companies have to pay for a good marketing team, customer service team, and after sales maintenance team for example. They might need the capital for certifications entering a new market too, for example. All of these cost money.

Grinder companies are still innovating too IMO. Burr design is an ongoing r&d in a lot of companies. Ionizer is another quite recent addition to combat retention.

Thousands in monthly production sold at close to cost might not be enough when considering ongoing expenses like salaries, r&d, etc.