I was initially gunna rage as well. But when I saw how he took it like a man, I was heartened. It ended well in my opinion. The end showed us this: it wasn't so much that he got greedy, nor did he bite off more than he can chew. It showed us that the reason for Kaiji's loss was none other than himself because he once more gave into blind irrationality and let fate decide what would happen.
He will never make that mistake again, and we shall see him kick some ass.