The Fly vs. NSR cost analysis is not as far apart as you may think. It all starts with the purchase price for either of the cars but for the sake of argument lets say the Fly is purchased for $30 and the NSR is purchased for $100. Lets look at the list of parts needed to build the Fly into a solid runner vs the NSR. I am not including anything about the amount of time it would take to complete the build.
As you can see here the cost is virtually the same. I am not arguing for one vs the other but I do think its important we are comparing them on equal terms of cost before making a decision.