Correct me if I'm wrong but at 10cents a kwh running 10,000 watts a month that would only cost $360 a month and would still be a somewhat normal bill but I must be wrong?
You are off approximately by a factor of two.
We're in luck because your cost and your wattage are both factors of 10, which makes the calculation easy. I already did it in my head, but I'll walk you through it.
Here goes.
You're running 10,000 watts and there are 1,000 watts in a kilowatt.
10,000 watts x 1 kilowatt/1,000 watts = 10 kilowatts.
There are ~ 730 hours in a month, so we multiply these two figures to get kilowatt-hours.
10 x 730 = 7300 kilowatt-hours
Now we multiply by your cost of $0.10/kilowatt-hour.
7300 kilowatt-hours x $0.10/kilowatt-hour = $730
Since you are in the hundreds with your estimate I think you made a mistake with the number of hours in a month.
Under this setup the number of hours you run the lights is the amount of dollars that you will spend.
This is because 10,000/1000 x $0.1 = $1
So roughly whatever your lighting schedule is, that is the contribution from your lights to your bill. The rest of your equipment and house lights if you're at a residence, as well as other appliances like water heater will make up the rest of the cost.
If this were in a home and you were on 12/12 lighting schedule I would guess your bill to be around $500-$600 depending on cooling requirements, size of the home, and number of occupants.