So you want to expand a mining project, may I know if you are sound enough to do that. Where is your location based, cause it's not that easy to mine coins and you are offering as low as 600$ that's like 200 - 300$ less per current price. Will you be able to hold a escrow for this service, it's difficult to believe you will be able to deliver at so low price. You will have to back up a lot of proof for people to be keen to invest in you.