Hopper 3 HD space questions

Two questions:

1. It seems like deleting programs in the Prime Time folder doesn't free up any disk space. Is this because the system reserves a specific amount of space on the drive for the PTA no matter how much you delete in that "folder?"

2. I was surprised to discover - I think - that deleting programs in the "trash" doesn't seem to free up disk space. That surprised me - am I mistaken?

Thanks