The image details exactly how my (AntS5) profit has declined over the past 41 days.
My starting daily payout was 0.7341805919% of my principal.
My current daily payout is 0.262949915062229% of my principal.
My average daily payout declines -1.968164087% every day.
If this rate of decline remains stable, I will only make back 33.36612811% of my principal.
In other words, at this rate I will never make my money back and instead I will lose 66.63387189% of my investment.
The two key factors contributing to payout decline are difficulty increase and BTC/USD denominated fees.
If you would like further explanation, please let me know.