Money has become pretty devalued anyway -- it's not like it's hard to achieve 200+ gold incomes, what with the character shortages.
This is the
real reason trading is broken. Lords that have food have no reason to seek buyers for their food. They have all the gold they need. The poorest lords are lords of regions that have no appreciable food surplus, so no real food to sell. The lords that have lots of food also have regions that have lots of gold from taxes. Letting food rot costs them nothing, as it's all make-believe food anyway. What do they need another 100 gold a week for?