People should know that you can't "just" turn down a promotion. You might be leaving management in a tough position where they were hoping to rely on you to fill a gap, and by turning it down, you're making it hard for them to be objective. They might default to seeing you as unreliable, and cut off future advancement opportunities (the ones you actually want). It's not fair, but that's how people think. This isn't a big problem when the money is free and everyone is trying to poach employees. You can just jump ship. But in this hellish economy, everyone is stuck. So take that damn promotion.