"netbtc Ltd. is a legal entity in UK. We specializes in Bitcoin mining and trading. We trade on bitcoins and the profit is shared with our investors."

This is literally all the information I can find on your site that describes what your buisness plan consist of. Please don't take this as an insult or anything, but if you expect anybody to invest 22.500 $ (25 BTC), then surely you must have a better or more descriptive plan for securing or investors payments.

What is your largest investor right now (amount wise)?