well there were a few total scams that actally used the term 'bank'
but thats another story best left in the past, and am glad some of those died already
now as for 'magnr', they are a scam and they fled already
bitbond and btcjam are slowly failing too
your best bet is just to hoard the bitcoins on your own private keys and wait for the deflationary nature of bitcoin to make the fiat value of them increase.
asking any stranger you have not met to play the markets for profits on your behalf.. even if they genuinely do play markets instead of running.. does not guarantee profits.
and if they do run.. good luck finding them to slap them with a wet fish (court order).
these parasites never ask for large amounts of $5k plus in bitcoin. they prefer the noobs who throw less than $500 of bitcoin. because they know when the scammer runs its not financially viable for the victim to raise thousands of dollars to take them to court just for a sub $500 loss..
so again dont trust people promising guaranteed profits
dont trust people who are not licenced but pretend to be financial businesses
dont trust people unless you KYC (Know Your CORPORATION) (yes i know C=customer.. but it works both ways)