[SamAdams76]

"I've been tellin' ya for forty years now. Don't buy anything. Don't get anything. Especially nothing flashy or big. Haven't you been hearing what I've been saying all these years? Why not? You're going to get us all pinched, that's why. What are you, stupid?

[SkyPilot]

[lowbridge]

According to henry hill, that scene of jimmy berating the others for spending their loot on flashy things was a bunch of nonsense invented for the movie. They were openly buying themselves nice things and they didnt care who was watching.