although very small amount of bitcoin is really very risky but you still can buy a good amount of alt coins in alt coins section, as there are available a very very cheep but potentially alt coins. where you can make a good profit.
Yes you are right on trading there are high risk and best choice for trading with low amount of capital if be compared with trading bitcoin to fiat money, we can trade altcoins although it will not become free risk because on trading or instrument of investments there are not free risk.