I've been contemplating the issue in the headline, as pertains to my value. When I help somebody in 40 mins with something they've been stuck on for 3 months, my value is clear to everyone. When I work there the whole time, and nobody ever gets stuck for 3 months, my value is unclear. Don't know how to deal with this paradox.
Think that it is the management's fault if they misjudge you. They have the chance to judge you correctly, yet they misjudge you. Their fault entirely.