Back in the day most of the builders were kids. These parts packs seem to me to be over the head of the kids they were marketed to back in the day. I was not around when they were first on the scene and I do have more than a couple of the latest release engine kits. I even picked up a few Chevy packs.
I get that I am a little younger than most here, so I am chasing the older kits and parts. I never had the chance to get them. Do I think they could sell 20,000 of these no. But there is only a few parts to the Pack so they should not require the higher costs to break even.