$19.95?  Wow. 
My Mac ported Tron 2.0 was $39.95.  Although I would have to say that it is worth every penny I paid for it!  I generally don't buy games for my computer because I have a PS2.  I see my computer as my workstation and my PS2 as... well... my game console.  Tron 2.0 is the third game I've ever purchased for my computer - the others being Alien vs. Predator and Alien vs. Predator 2.  Being a huge ALIEN and Tron fan I couldn't pass up any of these titles, and I'm incredibly pleased with Tron 2.0. Actually, the further into the game I get the more I love it.
As far as the sales go: I don't have any figures, but MacPlay extended their discounted price of $39.95 beyond pre-ordered copies due to an overwhelming response from Mac-based gamers. ...And if a version is ported for PS2 you can bet I would get that as well (only cause I'd love to play it on a screen bigger than 21" 

 )
The game would appear to be selling well, and as has already been mentioned: game sites like GameSpot and Game Spy gave the it high marks.
...as far as bootlegging games goes: just go out and spend the dough to buy the game...  It's not like your looking at a price tag like that of Maya, or Lightwave, for Chrissake!  Most people with even a part-time job, or a paper route, could afford a video game. 
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