There's not a single thing I've downloaded over a torrent I'd have ever paid for without first getting it via the torrent.
The other thing is that I think good natured people like you who want to pay for movies after watching them are very rare. The majority of pirates don't follow by your way of thinking, I would guess.
So I will see if it's any good, THEN I pay you. That's how it should work, just like it does in a restaurant: you consume their content, if you're unhappy with the product, it's acceptable behaviour to complain and not pay. Why should I pay them to waste my time?