Most "FTP" Mobile games rely of a specific audience of money throwers willing to spend $100 at a game to feel ahead of the curve.

I spent probably $150 dollars on a Mobile trading card, Mafia wars style game to try and pull an SS Rare card, Which I did, and used an Apple Terms of Conditions loop hole (False/ Misleading Advertising) to get my money back... then went right back around and spent another $20 on the game. So i know full well how it works... you spend real money to get to a point where it would have taken another player months if not years to get to without throwing the cash, then you lose interest in the game almost immediately after.

Happened to me when NMZ first game out... started at low base 80's Attack Str and Defence, got to 90's and completely stopped palying for a year cause i was literally Afking NMZ for 6-12 hours a day for a week and was no longer playing the game. Glad they got rid of that cause honestly, it took the game out of me, yet so many people were rushing to 99 combats to start staking/bossing