I've been messing around with making "WEALTH" the social class (including purse strings, influence, fame, etc.) . It can be modified as people rank up (just another thing to spend xp on). To rank up: EACH WEALTH RANK COSTS TWO POINTS.
Broke - Add 1 purple die to all relevant social checks (never a benefit, even when dealing with ex-cons)
Poor - Add 1 black die to relevant social checks
Comfortable - Add 1 white die to all relevant social checks
Affluent - Add one yellow die to relevant social checks
There was also an interesting chart in an old AD&D supplement called Mighty Fortress that I thought about expanding. Here's the gist of it:
Social Standing Background Roll (was on a d20 chart) (from AD&D p55 Mighty Fortress)
Broke
Social Outcast
Poor farmer, craftsman, servant, or peddler
Poor (Commoners)
Successful farmer, clergy, craftsman, or peddler
Well-to-do farmer, craftsman, or clergy or servant
Comfortable (Middle Class)
Poor soldier, merchant, landowner
Successful soldier or merchant
Successful landowner or clergy
Well-to-do soldier or merchant
Well-to-do landowner or clergy
Affluent
Impoverished squire* or knight
Well-to-do squire* or knight
Wealthy squire* or knight
Impoverished titled nobility**
Well to do titled nobility**
Wealthy titled nobility**
* or constable, sheriff, mayor, burogmeister, or military officer
** Titiled nobility: Baron, viscount, count, earl, duke