What is your take on programming companies that won't give you the source code on projects that you paid for? A software company that won't turn over the sourc

What is your take on programming companies that won't give you the source code on projects that you paid for? A software company that won't turn over the source is going to resell/reuse that code. Your analogy implies that a design firm will reuse/resell the PSD and it's hardly a reusable item.