I have 2 theories based on his face in that image.
1) Someone, (Batman, Two-Face, Harvey, rival crime boss), burnt his money and he's pissed at them.
2) Someone stopped taking him seriously as a criminal so he burns it all to show that he is not someone to be ^^^^ed with or taken lightly. Afterall, he is psychotic so it's feasible for him to think it rational to burn millions of dollars to prove a point haha.
1) Someone, (Batman, Two-Face, Harvey, rival crime boss), burnt his money and he's pissed at them.
2) Someone stopped taking him seriously as a criminal so he burns it all to show that he is not someone to be ^^^^ed with or taken lightly. Afterall, he is psychotic so it's feasible for him to think it rational to burn millions of dollars to prove a point haha.