There is no such thing as capitalizing without the risk.
If there were guaranteed profits of 300-500%, people would be doing it themselves and not giving the profits back to you.
Don't say people didn't warn you.
I have to agree with others that theres no such thing has making profits that large without there also being a large risk involved.
I'm not saying to not trust the site but I also have to ask who owns the site. Anytime you're going to hand over hundreds of thousands of dollars to somebody and trust them to keep it safe it's a good idea to know who they are. I see far too many bitcoin related sites and services were the owners remain anonymous, that's never a good idea to give that much money when you have no idea whos looking out for you (or not looking out for you).