You might see that happening around the Diplomacy Micro release.
Reduce sins to $20 (making it more enticing to possible customers such as those who hear of it by word of mouth).
Leave both expansion's for $10 (to generate revenue from new and old customers).
Sell Sins and both expansions for a $35 bundle (the slight reduction further enticing those who would have only bought Sins to buy it along with the expansions from the offset).
