Actually, it's historically accurate for nobles to squeeze their peasants out of every last piece of gold, even to their own detriment. In fact, BM only allows one to scratch the surface of what was done to exploit the peasants. In order to simulate reality better there should, in addition to high taxes, be options to...
...1. implement antiquated laws that have long been forgotten, so that peasants would unwittingly break them and have to pay fines for atonement.
2. Ban a random economic activity; allow only those who purchase permits to partake in it. Fine everyone who does it without a permit and put a high price tag on the permits.
3. Initiate a phony war in order to necessitate phony war taxes.
4. Fix the value of currency (by threat of force) so that it is high when debts are large and low when revenues come in.
