Its over the top with N2003. You'd have to be really serious about your Nastanks and ovals to buy it. 50 quid isn't extreme, I heard 200 dollar stories!
At those prices its less of a rip-off to try a 'free' version of the game. Thankfully I never got to like NASCAR, and the GTP mod has in some areas got worse physics than ISI so I wouldn't call it value for money even at normal retail prices
Yeah, I'm sticking with the default NASCARs on my game, can't be bothered to try the mods and modded physics usually have dodgy bits (like most arrTractor mods).
thats more isi/rfactor games that have the dodgey mods than does nr2k3, as it doesnt really have that many. the pwf ones were done very well (trans am is my fav) but thats about it, GTP was never finished really.
expect nr2k3 to drop in price after iracing releases their new game though