very simply put if you turn what some of us do as a sport and for fun into a speculative commodity then you tend to corrupt the very nature of it. That and it increases unnecessarily the cost to all, benefiting only those who are interested in the item as an investment and not for it's purpose.
Unlike other sports motor sport cannot be done anywhere it has to be done on some sort of motor sport arena so increasing the cost because of speculative investment adds nothing to the sport but increased cost to all...
so no it's not stiff. it's an ethic which has to some extent limited the level of speculation and kept the costs down to those of us who don't want to be or presently need to be multi millionaires to enjoy our sport...