Trading is double sided, instead of being rich on it you may lose because not all altcoins is promising they may not last for a long run and you need a big capital if you want a bigger profits. Well the posted above is right, if you know how to manage your investment then you can be successful.
All the investments are risky and no investment promises you profits every time but that risk can be minimized if you study the market well before investing and if your research goes well then you can make some really good money from trading.