If Bereket could just teach 10 more people to work like her and those 10 more people could also do the same, it means that the knowledge has reached 100 citizens in just one round. 100 x 10 is already 1000.
If it was how to steal or cheat then there would be more and more people coming in in droves and joining her on their free will.
But in the case of hardwork the demand is not so high.