I liked the movie very much, but I won't ever watch it again. It was hectic and exhausting and so very sad.
Howard's gambling addiction was well-portrayed, and his ending felt inevitable. He couldn't just quit while he was ahead (or just breaking even, like at the almost-end when he had the money he owed in hand). It was all about the thrill, the rush, for him, and he wanted so desperately to win BIG that he couldn't read the room. It was completely obvious to the audience (not from bad writing, just simple cause and effect) that the blond guy was just biding his time in the cage, but Howard never anticipated how it would end.
I loved how Arno was so impressed with Howard winning the impossible bet.