Okey. I agree. But just proposed another look on it. You could get this material on ebay for let's say 10 $ from somebody else. Anyway this money would go to some dude. And to pay 10 $ for postage to him. And let's say one has only 10 $ for food for next month. What is the good here - not to practice for a month and wait or practice? What is your look on it? And must you buy a material from lineage holder or if you buy it on ebay is it SIN?
Since all arises from the heart, it's the intention that makes your deeds pure or not. You can pay $10 an entry ticket to a place physical or online when you can have "free" material, what makes it a wrong doing is your intention to get stolen material. Ebay is not the problem, your intention is. The same if you register to a public library to borrow books and dvd's and make copies of them. Although you payed for registering, if your intention is to copy them, then you're stealing. that's simple.
If you don't have $10 to spend on a teaching but only on your food, then what's the problem? Avidity is the problem which makes you wanting the teaching and the food when you can only have one of them at the moment. Make more $ to be able to get both. That's creating right karma. If I give myself excuses to steal, kill, there will be no ending to that.
Edited for spelling