Right now the opportunities to use pebbles are pretty limited. Once you've obtained the companions you want to use, there's not much by way of NPCS to spend pebbles on. That's a somewhat minor problem exacerbated by the user tradesmarket. Due to the decreased need for pebbles/increased need for moonstones, players are disincentivized to list anything for pebbles. This further decreases the value of pebbles and increases the value of moonstones. That might sound good for the survival of the site, but right now the going rate for a any wolf on the tradesmarket is at least one USD--wolves with good coloring routinely go for 25-100 USD. That's just too much money for a sustainable playerbase. I really think the only short term solution to this is to stop allowing players to trade moonstones directly. For players who want to spend a little money to avoid some of the grind, this allows them to purchase items for moonstones they can sell for high prices in pebbles. This then allows them to spend the pebbles on things like wolves and craftables.