[LoloMo]

Micah, I think if lots of people bid high on MA Ulm in your example, then it probably means Ulm with the iron mine bonus is pretty much in demand.

To prevent extreme imbalances due to LE Rlyeh theme unpopularity for example, a suggestion would be to have a second or third round of bidding, where you can adjust your bid upwards (upwards only never downwards, and by a minimum of 30% higher than the winning bid).

The more rounds of bidding the lower the minimum bid increase can be. But a lot of work to tally it though unless it is automated.

Edit: Can also limit the second and successive bidding rounds to submitting only one increased bid per player.