If you will invest 0.1btc is just barely enough to start at trading and profit and grow your capital.It is ok to put all your money on trading rather than any ponzi's online
That's true, you should invest on trading in bitcoins and/or altcoins, as this will never let you go to zero and will at least leave you something, but in gambling, when you lose, you will lose everything and nothing will remain on hands and you will surely cry in the end...