I believe there are serious economic balancing issues. Trendy seems to be twisting their economy to the elite few that have billions of mana and post on this forum.
When I buy a pet from the tavern Keeper for 75million, should I want to immediately sell it back I figure I should be able to sell it back for 20-50%, but no, The price of resale is 65,000. That's right; Less than .01% return on "value". I'm not saying this is what I care to do, but simply that the sale value with the tavern keeper is gross.
Maybe I'm just not savvy enough to know how to make the kind of dough that these fe