Oh, that font idea that Gangsta tossed out. That could work. Trebuchet MS is like the masterrace font, so you could use that for staff + bolded, and then something like Arial or Times New Roman for regular users. Would that help distinguish the two groups?
As for what Link said about usergroups... if each usergroup was eponymous to the individual buying the colour, could they be easily managed and sorted or would that still create too much clutter and/or interfere with other stuff?