Why are models of cars so pricey?

If im not mistaking the most common 75 duster is the mislabeled dart sport ?

That is the one I have seen the most..didn'r realize that it was a Dart Sport...just couldn't figure out how to take the hood scoop off..

there is this MPC kit (going for 31 as I post this, expect it to sell for about 70)

this is the one I have been looking for...BTW, shipping for all of 'em is @ 25 bucks for me..

and then there is the convoy chaser not sure what it is, 73-75 dart sport ?

Are they all dart sports ? It has the hood scoop I would like but not the tubbing nor the hemi..

Did someone here say that the mpc will be re issued ?

Thanks
Ian.