Appsuch is too expensive in my opinion, it costs 3700 usd to deliver 10000 installs, this price is totally unreasonable for incentivized installs. You can get 10000 real organic installs from Appbrain + Facebook with a slightly higher amount of money.
I suggest all of you to try using app2top.org with which you may get same 10000 installs all on same day with just $1000.