The Time Travel in itself causes a paradox. For this I will use Bob A and Bob B. Bob A is from the past; Bob B from the future.
So Bob A gets the money, and then life pans out into a catastrophe and he becomes Bob B. Then, somehow, he travels back in time to meet Bob A and tells him not to get the money. But the money is the cause of Bob B's existence; if the money isn't taken, then this can never happen and there is Paradox.
But it gets worse. You see, Bob B is changing his own history. If Bob B, before time travelling, realised that in his history Bob B had come to stop him, and failed, then why would he try the same thing? Bob B wouldn't go back in time, but then therefore it would get rid of his reasons for not doing so.
Ultimately, I'd have to shoot my future self before he had a chance to explain about anything else. Then, that simply forms a stable time loop, and in the future I would go back in time because I knew I had to die.
Thanks.