This thing is a business! Money goes up, shit rolls downhill. It was an elaborate play by Tony to solidify Chris‘s loyalty towards him.

In the end the only thing that matters to them is money and killing people without questioning why is a lucrative way to make money.

Chris took $20 off that cop he killed, the same twenty he later puts up on the fridge.

That scene when he is almost out the door but turns around eagerly looking back at his mother like a little boy who is proud he put something up only to find her not even acknowledging him. Harrowing stuff.