[Suicide Junkie]

Changing the symbol is easy.

The planetary value would involve how well the local people take to space work. Think combinations of local gravity, culture, tech utilization, etc. Universities could improve the value via education. Extraction/Recruitment centers would probably reduce the value, since they're skimming off officers.

Or if you want the resource to be more general "work", then the value would be the economic efficiency of the colony. Work storage facilities would be vacation centers and amusement parks (When not needed, people "take vacations" (filling storage), then later they "work overtime")