I remember betting 0.2 bitcoin at once. I was thinking the simple rule that house always wins. So if I gambled with 0.2 for too long in the end house would have ended up in profit. So I did what I thought was the only chance, put it all in at once and hope for green. It wasn't 
Yet I still believe that instead of doing any "strategy" or "tactic" or whatever people are doing, just straight up putting all in and gambling once to make more is only way you can win and leave.
Yet I still believe that instead of doing any "strategy" or "tactic" or whatever people are doing, just straight up putting all in and gambling once to make more is only way you can win and leave.This is crazy because 0.2 btc is like 1300$ which is a good amount for many people. If you can afford to lose this much then it is fine else ideally you should have some discipline and only play with those extra money which you can easily lose it and still you are okay and would not effect you much.
I cannot imagine what will my feeling if somehow I lose for that amount because of 0.2 btc is too big for me and I don't want to use that amount for playing a gambling game. for me, if I use 0.005 btc, it's still too big for playing gambling and for 0.005 btc, usually, I split for a week or more so I can play in every day if I have a free time. but still, using a big money to play a gambling game is not good for me and I don't want to get a big loss in one-time play.
3 years ago when I started to gamble with bitcoins 0.2 btc was less then 40 dollars, you can`t imagine what kind of gambling was that. With 0.5 you have around 100-150 dollars and when you know minimum bets were in cents it was great to gamble with bitcoins, with 0.5 I had chance to start with satoshis and push martingale to almost whole bitcoin sometimes. When bitcoin price raised a lot many casinos didn`t think to lower their minimal bet, so 1 mbtc 3 years ago and 1 mbtc now are two different things. I could be filthy rich person now only if I kept all my winning in bitcoins, but I invested in other things, I withdraw a lot of bitcoin, but I don`t regret, gambling with bitcoins was one of the great things that happened to me in my life.