Are you offering any kind of collateral for this "investment" or is it based entirely on trust? If on trust, then why should anyone trust you?
It is based on trust and a valid registered company at the Dutch chamber of Commerce (and a contract).
I've done trades in BTC for a total near 300k in the past on this forum. Some shows in my trust rating, and hopefully their are also people here on the fprum that can bouch for my previous webshop (usbminers.nl ) that was one of the biggest webshops in Holland for the mining community. Their are forum members here that have ordered for over 50k at my store in the past.
Your trust shows that you have only been entrusted with a few hundred to a few thousand dollars worth of others' money at a time, and for short periods. Your trust also shows something closer to around $10k in trades as opposed to $300k, although some of your trades may not have involved the leaving of trust rating at their conclusion. Could you maybe have some of your trading partners post that they have traded with you, the value of the trade at the time of the trade, and if they trusted you as part of the trade?
Another concern is that most of your trades involve Casascius coins, which is Suspect is not the case for your business proposal (I don't know what you are doing, so I might be wrong on this). How much experience do you have in the line of business you are proposing entering into? Even if you are not going to outright steal the money, this does not mean your project will automatically be successful.