I feel like the economic system needs a way for incentives to buy dino's / items, other than for regular PVE play (bosses where mostly Tek Rexes only are used).
Maybe there is a way to make events where world bosses are spawned in which are extremely strong and require many and strong dino's to defeat. Perhaps its even possible to set certain rules, ex. only use Carno's or Ptero's etc.
This way there is an incentive to breed many different kinds of dino's and to buy / sell them trough the market place.
Anyway, this is just a suggestion, maybe there are other ways to make it possible to recycle dino / item life to incentivice the trade for dino's and items.