Ugh I'd be happy even if it made 1-2$ a day per pc. Heck at $300/day who would argue that? So much wide spread info on the subject of mining. It's so hard to learn what's legit and what's bs.
I'm not sure what CPUs you have.
Lets assume you have five hundred units of AMD A10-5800K 3.8Ghz.
In that case, each CPU will be able to perform approximately 105 Mhash/s.
If you simultaneously run 500 of those, you'll generate about 52.5 Ghash/s.
At the current exchange rate, these 500 CPUs will generate nearly $0.03 per day
total (not per PC) if you run them 24 hours per day. If you are only running them 12 hours per day, then your total revenue will be closer to $0.015 per day.
Of course, you'll be running those CPUs at 100% continuously, so they'll draw quite a bit of electricity. You'll probably spend $0.20 per day per PC ($100 per day total) if you are running them 24 hours per day mining bitcoins, and $0.10 per day per PC ($50 total) if you are only running them 12 hours per day.
So, you get to choose.
Mine bitcoins with them 24 hours per day and lose $99.97 per day.
Or mine bitcoins with them 12 hours per day and only lose $49.985 per day.
Or don't mine bitcoins with CPUs and lose $0.00 per day.
