With the recent runup in Bitcoin price, I find that an S5 earns about $1/day NET of electric at the electric rate I am currently at.
No idea how long that will last, but on the other hand there are other areas of the US that have somewhat better rates for us SMALL miners than where I ended up at.
Are you certain you earn "$1/day NET of electric"? It would be interesting to know your electricity rate.
Even if your electricity is free you would currently only earn about 90 cents a day with an S5 (Bitcoin at $660).