i cant treat like greedy , i control my feeling , and always play with small amount , i always win
You always win? believe me it's just you're getting a good luck. But indeed, if you can control yourself in gambling, you are a good gambler because self-control and discipline is the most important thing for you to succeed in gambling and that you're not addicted. But it is great if your victory continues for a long time, it means that your strategy was running smoothly.
He's just lying. You can't always win especially when you're gamble. Even though he's used highest win chance, he'll losing in the end. Maybe he's just gamble 0.001 btc (because he said he's just played with small amount) and always stop when he doubled his btc (I'm sure he was just lucky enough, there is no any strategy will works for a long time)