if you look at comparable systems on the market, they're about in the same ballpark for the components that are included.
for instance, splined torsion bar swaybars are generally about 8~1K more, brakes 2K, double adjustable coil overs another 1500 or so, power rack tack on another 350
then add on some subframe connectors at another tree-fiddy plus and everything starts to even out.
so even if you have a "custom" IFS front from say scotts or AM for say, $3500 there's another 4~5 G's worth of the good stuff you'd need to get at the same level.