I'm not sure if you're aware of your own reputation. You simply are not going to find anyone willing to finance your site, as good as it is, without collateral and solely based on your word for 1 BTC.
If we can't get the full BTC1 investment we are looking for, then all current investors will get their money back!
This makes absolutely zero sense to me.
Why not just ask for investors first, and if there aren't 10 investors exactly, just don't ask for deposits to be sent? Instead of having the investors risk to deposit first then be refunded, where there is a larger credit risk.