I would be interested to see what happened if someone did that. My guess would be that the content producers (movie industry) would begin legal action as while you paid for the content you didn't pay for it in the manner they dictated.

The point of the cashier's check is that they don't know who you are. I have a hard time believing that someone who paid market value for the content and didn't even require distribution service would be in a worse position than someone who pirated the content and paid nothing.