How about respect? Sometimes people are just looking for recognition of their efforts through respecting their time and brain. People want to know that their reputation doesn’t need to be proven time and time again. As well, many people long for and deserve the faith in them that comes with having been there before and having been successful at whatever you have thrown at them in the past.
Lastly, trust. Trust and respect pretty much go hand in hand, but continuing to trust people with more and more responsibility or freedom helps grow relationships where there may not be opportunity for advancement. When employees feel that they can still grow even if their title doesn’t change, they are willing to stick around for other opportunities that may arrive.
Improve your ART-work, and you will see just how incredible your workplace can continue to become.