I think in the workplace depending on the field appearances matter to some extent. For example, in the service industry, appearances matter. In the business sector, appearances matter somewhat also. But, it is not about being pretty but looking sharp and well-dressed, not about physical beauty itself. I don't know what field the OP is working but it seems shallow. Why would only the good-looking people be promoted? Are you sure you're not mistaking being well-dressed and being well-groomed for being good-looking? I find it hard to believe a company would promote only good-looking people unless it helps the company financially. And, most companies believe in profit.