Rising my bid just by one cent (someone would say that I doubled it) I got much more impressions and clicks than before.
Here are some figures to understand better the difference on a 24 hours statistic:
since my campaign was approved just 15 hours ago the values you see are extrapolated from the actual trend.
As you can see the difference is very big!
What about the conversion rate? Well, with the $0.01 bid it was hard to tell, but with this new campaign it is immediately recognizable a peak in the downloads. In less than 20 hours I triplicated the daily install average from USA passing from 10 to 30.
It is early to make a reliable statistics, I'll come in the next days with more data.