If you trade for some time, you might experience some unpleasant things!
I was totally happy and started to grow my first real money account. Soon I discovered, that my trading costs were way too high. I needed another broker, so I switched. Then the markets changed and I became afraid and took out the rest of the money at the exact wrong time. That was frustrating! My MQL5 system went out of business on January 16th 2015, the same day when my new british broker (sounds similar to the word Alpaca) declared bankruptcy.