Squiffy, they are not completely different. Just because poker is more narrowly bounded than the stock market does not mean they necessarily follow fundementally different rules. Suppose for a minute that the market was as narrowly bounded as poker. Are there different rules between them? Or do you believe the short term market wealth creation caused by expansion and innovation cannot end. A perpetual motion machine?
It's interesting that for a short time a zero sum game can appear to create wealth for all the players. Such a situation can appear in poker under conditions I outlined earlier.
Is that what's happening in the market? Whatever you decide, you must know that resources are far from inexhaustable. If you are planning to pump "all the matter in the universe" into the market, then I have some land on pluto to sell you.