if i have 13 bitcoins i would save 10 btc into cold storage and 2 btc for invest by buying an altcoin and i would spend 1 btc for playing my favourite gambling games blackjack
Gambling is your choice. So I don't want to say anything about it. You are going to gamble away the entire 1 BTC, or are you going to stop at some point, and say that: "I had enough. Let me keep the rest for long-term holding"?