Well loved artists and designers with massive fan bases could see four figures come in from a successful run of toys. Inspired and talented designers who are just starting out might see “sushi money” come in from a successful run of toys.
There’s a complex pile of factors at play here. It’s moderately expensive and very time consuming to make a run of toys, and even more time consuming selling the result to collectors. Make too few, and the price for each toy becomes too high and fans lose interested. Make too many, and the price will come down, but the designer might get stuck with unsold product and wasted money.