[fasteddie]

$1.50 CPIs? Try 2-3x that, even more at enough volume to get to top 5 -- where the chart position really matters

[nstarkell]

You can get the CPI of $1,5 and even $1,2 if you track sources of users and analyse their actions within the app. Then you filter out sources of traffic that sell you the dead users. You can do it manually (i.e. a small army of marketeers). You can also use automatic tools such as AppInTop.