If you look at the expected ROI for mining equipment, I think the returns are reasonable.
ROI for a mining rig is usually about 12 months not including any location costs.
The mineum team raised about $60,000 and is currently paying about $5000 in dividends each month, giving it a ROI of 12 months.

Keeping your BTC would have been a better investment, but your ROI is what you would expect from mining.