[fjin]

If you have player account system in your MUD, then you can give RolePlaying points, or something similar. Then players can spend those to their Next character, and buy certain priviledged, like Noble, or Clerical status.

One way to make certain socially high ranking characters less tempting is to artifically limit their available skills, or those have consequenses, like loss of dignity, or charisma.
Nobleman just don't do farmwork, tend horses, or kill, butcher, and roast their meal, if there is any workforce around to do those .... works of commoder.

So, Nobleman or Church cleric should buy their food from Tavern for example.