300 people a day aren't blanket harvesting all the asteroids. they're harvesting strictly the large charodium asteroids. hopefully these stop being replenished going forward. theres no incentive to leave the safezone if big roid charodium harvesting in the safezone is even remotely similar to the credits/hour as anything else in the game but with NO RISK AT ALL.
another thing adding to this is charodium is needed for every ship craft. and the only way to harvest it right now is from the safezone as its not really found anywhere else practical. (if you're going to tell me you will fly out to the center of the ring to bring back ore that is less than 5k per slot I will laugh in your face)
Charodium needs another place it spawns, and large (70-80 stack) roids need to be eliminated from the safezone full stop.