Team, I know it is not the right way to do it but maybe someone out there need it I just came across a website that do app installs, reviews and rates, to be honest i didn't try them but maybe someone need them. http://app-reviews.org/
Wow! 4USD the review is very expensive! You really rather invest into an ad campaign. Even a video ad will be cheaper. You don't get the same amount of reviews but you will get real players who will play your game which will generate you income. I really don't see a reason to boost your app with something like that. Or is there anyone who can stand me corrected?