I wouldn't say that is fairly inaccurate, I'd say its grossly inaccurate. Like you said, it doesn't take into account tracker overlap, but it also doesn't take into account those who downloaded the game, decided it was worth a purchase and then bought it. It also doesn't take into account re-downloads, stops and re-starts or canceled downloads. If that is actually the method that developers and publishers have been using to show piracy rates, shame on them for touting clearly suspect figures as the justification for DRM and price increases.

Sure, I have. As I've said, far too simplistic. Heck, you can spam the basic turret on all the levels and win. I find the basic concept of the game a bit weird, too - I'd think a large part of the target audience couldn't care less about production values.
If they'd be paying the same either way, it'd result in increased total utility, at no cost to the developers. So, why not?

All points that are spot on. I guess I was just saving "grossly" for later in that sentence, and need to expand my list of favorite adjectives. ;)

Buy this game. It will be worth it, game is really amazing and addictive. You must show your support.

I'm still playing TD on WCIII.
No thank you.
Although I watched the demo, and it looks really cool, I am not willing to spend that much right now. :D