But there's your problem, the children buying posters aren't the ones buying the cars. They will build a car to sell to their targeted buyers, who used to buy the posters, but have now grown up and become investment bankers, city traders or the ceo of mega corporation. There's a reason Lamborghini will churn out hundreds of thousands of cars a year and pagani will only sell a few thousand.
As times move on, so do standards, when the diablo or countach were unveiled I'm sure there were some people saying "God, I wish they built cars like the old supercar manufacturers."