This would encourage people botting elementals. People would constantly camp them to the point where they would use 3rd party tools to out claim others. It's a bad idea and the main reason why the geos dropped off every monster and it's mother. It was so the specific monsters wouldn't be congested when players farmed for upgrades.
Just raise the fire weather in the three regions that have fire weather. The avatars could also drop a few of them in the BC fights. This way a player could work toward completing goals without reliance on the current supply or demand. They could just kill an avatar every day.