So let's say you want to buy a painting for your house. You've got a few options. You can go online, look at various items and choose to buy it. You could go to a gallery, look around and decide to buy whichever one suits you.

But crucially, you get to what you're buying before you commit to the ownership. You may not own the rights to the paintings (its probably a print), but you know what you're getting. Why would I pay for a movie if I don't know whether or not it's worth it.

Netflix, Hulu, amazon, etc. Are like galleries. They have an entrance fee and that's ok. But what most of them don't have anyway for me to actually buy a copy. Netflix movies require you to pay month over month to maintain access. So you are forever required to go to their gallery.

Like your friend, I'll pirate to watch a movie and if I like it, then I'll buy it. I try to buy physical discs, but they are becoming more and more rare. I pirate because I want ownership. Subscription models work because they are more convenient than physical purchases. But that convience is getting smaller every day.

There is a few reasons why I want physical copies. License deals expire and thus the content may disappear from the service it's on. My internet may be out. Yes, I can download, but that requires inconvenient forethought and you're always limited in the number of downloads and quality of those downloads. Having a large collection of movies in my home means I'm never without option.

Basically, I pirate because I'm not going to buy something that I don't know if I want it, and because I'm a doomsday prepper who has no other option 90% of the time.