Wow, that's a huge improvement for Android Market sales figures in general. Just 3 months ago a top 5 app was getting $64/day http://news.ycombinator.com/item?id=796685 and now #14 in travel is getting as much as $156.
Remember that "we will win a competition" does not make a good business strategy.
Personally, I think it might be the latter.
Android Market sales were stagnant because very few people had Android phones. The floodgates are however opening and in this coming year I expect sales will grow tremendously when the dozens of new Android phones are launched.