I think you'd be better off going to the nearest bank with your $1,000 and buying an I bond. It's not a popular thing to do (only grandmas seem to like these things), but it's a pretty much slam dunk investment with zero risk.
Assuming the cost of the electricitiy is 1.26 cents per kwh, and your machine is running at around 800 wats, constantly, that's 720 hours and 576 kwh, seven dollars a month...so the cost of running doesn't seem to be that high either.
Edited for bad math. May continue to do so. Please point out errors.
1) Since 1971 (40 years) is roughly 1300%, which is 19.63% annualized (1.1963^40 = 1300).
2) Since 1950 (60 years) is roughly 7680%, which is 16.08% annualized (1.1608^60 = 7680)
However, a mutual fund represents a consistent and safe income. I very much doubt that bitcoin mining will remain as profitable as it is now for very long.