You can search KShark Apps on google for all the proof you need, that's the firm I manage.
I am just like any of you guys, didn't have budget to buy expensive ads and promote my app so the only way I could get this many downloads was to hack the system and find a reliable way that works every single time.
I have documented my strategy in the form of a pdf document. I was thinking of writing a book, but that will take some time.
So go ahead buy the gig, and rest assured that this strategy will work for you too. Although I am sure this information is 100% legit and works every single time, I would be more than happy to refund your money, if you think it's not what you need.