Fellas and Gals, like ThumperD says, it is more time than money in most cases and when it does finally narrow down to the micro dietary schemes of Lbs, the money factor takes hold. That is of course if you want to cheat neat and look stock.
The obvious way to shave the weight would be putting the car under the crude scalpel all the way to the last bolt standing, and then you just simply look like a race car pedigree through out with out that enigmatic appeal. Not that all out race cars are not appealing, but you get the point.....
The F.A.S.T guys are guilty and innocent of all this to the core. Though some of them are at full curbside weight.