1. lack access to credit cards or internet-purchase enabled debit cards (or banking altogether). they can purchase those devices with cash;
2. simply don't understand how it works or that it may stop working in the future;
3. can justify spending money on a physical device, but cannot justify spending money on digital goods or services (according to their value systems)
You pay around 5 dollars to get access to a US Netflix account per month. Credit Card infra is still bad here, and the local Netflix is not worth it even when you can pay. Also, no Access to the others.
4. they either ignore, or are fine with, the fact that they are paying for pirated content, which IMHO is the worst form of piracy.
Also, point 3. does not hold up if they pay a monthly fee on top of the cost of the physical device.
I'd also like to extend your point 4 (or perhaps add a point 5), that some of these people aren't even aware they're pirating content or that they're breaking a law somewhere.