A friend at a mobile gaming company once had to run an analysis on the cost/benefit of spending her company's money in one of their game to drive it up the top

A friend at a mobile gaming company once had to run an analysis on the cost/benefit of spending her company's money in one of their game to drive it up the top grossing charts. The question was whether high placement on the top grossing charts could drive a lower CaC (the cost being the 30% of spend that goes to apple) than buying similar amount of users through FB ads.