I was speculating that the "Surprise" would be that you get to import all your gold, but when you tried to buy something the shop keeper would say "We don't want your tainted gold!"
Another thought was that the economy would scale proportionally to your unnatural amount of gold to points ratio.
For example:
A normal ratio of gold to points could be around 2%. In the game I set up to test the consequences my ratio was 78%. That's a multiplier of 39!
Therefore under the economies of scale "Surprise" everything in my test game would cost 39 times as much as a regular game. The cool thing is that the 120,000 gold I earned legitimately would be more valuable than the 1.2 Million that I cheated in my test account, a lot more valuable!
In this model incomes wouldn't go up just prices so it would take you forever to earn enough to buy the Castle which, instead of costing one million gold coins, now costs 39 million!
Something that takes away the benefit of having all the gold without taking it from you is what I would like to see.