bitcoin wallet isn't mine, it's on your site and you have my private key. I trust the profits, I don't trust the site. Who can guarantee me that after I have deposited on your site I won't lose all my bitcoin??. it seems a suspicious site...
You definitely shouldn't trust a website that offers you almost 20% a month just to store your coins.
"only you can decrypt your wallet with your passwords", so how the heck can you offer 20% a month for every Bitcoin stored in your wallet? At least most ponzi schemes will say that they use your funds for "trading" or "investments" to justify those gains. But not you. Would you pay me 1
BTC per month for nothing if I deposit 5
BTC in your wallet? ROFL