The minimum bet is indeed 1 satoshi (valid for all coins) but take into account that you only will get BFG tokens when you bet 0.01$. So betting less than that, has not a lot use as the house edge is also higher than compared to the other sites.
I think this is a good call for those gamblers who are afraid of losing big money despite their gambling addiction. They could minimize mental damage and just have fun all the time they want. Deep down in me, there is also this kind of feeling, that I don't wanna lose big time and bet as minimal as I could. I remembered playing just raindrops from one of the casinos in here way back I was just exploring betting sites.
For gambler who only want is to have fun playing well 10k satoshi will not a big deal at all knowing that this is a small amount which majority can afford to lose it, but if we talk about addicted I think they can't bet just 10k satoshi for their games because if you get addicted for sure you want more from your games especially the profit so the urge to win huge is high that's why as I see many of them bet huge for that thing. But for people who after for fun only I guess mostly of them are enjoying with 10k satoshi and they frequently do that just to extend their game time and to enjoy the game more without worrying anything.