Hi Max,
I only pay $50 for these 24's not running and even then when I get them up and ready for sale they usually cost me at least a week. I usually have to make up new Delrin bushes and clamps to hold the front axel in place (90%of the time they are all flogged out in the body) turn up new bushes for the front wheels or replace them, replace the motor or get the existing one running again, fix the height adjuster, fix the rear axel and or bush the rear wheels, new blades and maybe repair the blade carrier if the holes are flogged out, the list just goes on and on. And then if I am using a PT motor that requires extra weight to be added to the crank by whatever means I can. Then it is modify a carby and get that all working and that alone usually takes me a couple of hours. Are they worth it, of course not, but I just keep doing them to fill in time and keep me occupied