This would probably be incredibly hard to write, but it could be good because it would create a great benefit for people to actually buy things with the SMFShop mod...
A mod (I am using the 2.0 RC 1 version) that would keep a record of exactly when money was made. Then, whenever someone has made money that they do not spend or send to another user within some period of time, they start losing 1% of it a week.
This probably would not work when you have the bank enabled, this is only for people who don't use the bank probably... if that makes any sense.
