(1) Your points are valid, if the pirate would purchase the items if they couldnt download them illegally. Which cant be proven/disproven. So that point could go back and forth all day long, because without out some extensive survey to find out the typical behavior of a private its just pure speculation.
(2) And @ bolded, yea I bought all my games. I have a drawer full of receipts to prove it too. Matter of fact, I got 2 racks full of games to prove it too. Will be uploading to profile shortly. I've invested way too much money into gaming to have some1 I dont even know question me about it.
(1) That's a false dilemma. If you go to a theatre and watch a movie without buying a ticket, it doesn't matter whether you would have bought a ticket, you have seen the movie and benefited. Pirates absolutely love defending themselves with "Well I wouldn't have bought it anyway" but in reality it just doesn't matter. You aren't a thief because you enjoyed the pirated game, you're a thief because you played the pirated game regardless of whether you enjoyed it or would/would not have bought it.
(2) I don't believe it for a second. I don't believe that there exists someone who can say "Here is everything I've ever pirated and here are legal copies of every single item" whether we're talking about games, music, software, or whatever. It's not necessarily you (maybe you are that rare mystical person who defies my belief), but I don't have enough faith in people as a whole to swallow that line. Nothing personal.