Yep, that was exactly my dilemma. I was making a huge amount of income, so it was a pretty big risk to drop the price, but I knew I would only have the opportunity during the week I was featured. It very well could have dropped and failed.
I'm not sure how the Android charts work, but in the App Store, it's ranked by units sold, not by profit. This is the KEY thing that is crucial to how the market works. Even if I make LESS money than I did the day before, I will be higher up in the charts, which will get me more exposure, and eventually more sales. Going high in the App Store is all about upward momentum. The volume of sales doesn't change linearly with rank either, it's quite exponential.