Dapple, a colorful puzzle game, reported only $535 of profit after twenty five days, while incurring six months of development and $32,000 in costs.
Risk/Reward, a stock-based app, earned only $235 within two months of being released. Within ten days,
CubeCheater gained only $600.
Steppin earned slightly more at $1,712 within two months.
iLightning was one of the lowest public figures at $358 since launch.
While these apps could potentially earn these amounts every month, sales typically decline, not increase, over time (unless, of course you get sudden, high profile exposure).