I said it in that comment. But specifically, if more responsibility comes with the same or less reward than less responsibility, nobody rational will be motivated to do it. The degree of responsibility is somewhat subjective, but again you need to consider what else the qualified person might be doing that is more rewarding than working for you.

I said it in another reply but I should mention it here too. Not paying people well for their level of responsibility encourages corruption.

Not op but I guess the assumption here is that people would rather have less responsibility so need to be compensated to have more? I'm not sure this is true, but don't know if responsibility is its own reward. Maybe the status that responsibility conveys is?