A little bit correction, it should be 5% House Edge instead of Bankroll.
I do not think he is wrong to play at freebitcoin, maybe he like it so much so he do not really care about house edge or maybe he did not notice that it has higher house edge compared to usual dice game.
I'm wondering, when did he lose that much BTC. If it was happened years ago, means that he lost few thousands or even few hundreds dollar only. But if he lost it in the last few months then it is so big amount.
Yeah, HE only means you are going to lose your money faster on average. You may choose to play at freebitco.in because you like it for other reasons.
And I think the lottery tickets and reward points they give you when playing the multiply game decrease HE, am I right?