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But, of course, it's simply impossible to lose every bet while wagering 5 mBTC 3 times.
It is possible if he does it like betting 1mbtc per bet, losing 15 bets and losing it all in slot is possible especially if we play High-Extreme Volatility Slot. So it depends on which slot we play and how we play it (the bet amount per spin). But as you said, it is still profitable for him to lose 15mBTC as there would be 10mBTC remaining balance.
I was thinking of this possibility after making that post.
When I play slots, I bet as little as possible per spin. Most of the time it's $0.10, and sometimes it's $0.80, but I don't remember if I ever bet $1, or more, per spin. Although most slots have limits, like around $10 per spin max, of course there are slots with higher max limits. For example, you can bet $50 per spin on Book of Dead, $100 on Danger High Voltage, and you can bet up to €200 on Space Wars by Netent. And you are right, with such high bets it's pretty much possible to lose all wagered money. That's why I'd recommend to make smaller bets. From my experience of wagering, you can lose 20%-25% of your money, but hardly more than that.
