This track thing to me is a red herring. The real tracks exist in reality. If accuracy is SO important save up and go race on them for real instead of some cheap substitute on your PC.
Due to the G forces NOT acting upon your body, and inaccurate phsyics (which they will be) finding a good set up with a sim is totally pointless as you won't drive the same leaving the data invalid.
It's merely a vanity thing to have BANG on tracks. Yes it's nice to drive a 'real' track in a game, but it's nothing more than icing. If you paying this fee to pay for laser scanned tracks thats pointless. IMO I would rather not. In fact I find it VASTLY more interesting, and challenging driving newly designed tracks from scratch than apparently 'expensive' laser ones. SIm racing gives you the oppurtunity to challenge yourself in new ways, rather than driving tracks that ALREADY exist.
The real meat and two veg is the driving model, and online racing. iRacing does deliver on merit I am in no doubt (from what I have heard), but so what? NetKar, when working, is supreme, and LFS is just as good.
If people are happy to invest in iRacing so be it, but if your prepared to invest THAT MUCH on sims then surely why not just go the whole hog and do it for real?