Dan is right. But most people trade very small accounts, so they have no interest to grow 5-10% a month. They want 100% or more since they have very little money on stake. If they lose it all, ok, they put aside from their salary and start again. If trade 100k account and get that destroyed... different story. But then 5% a month on average is awesome.
Was mich nicht umbringt, macht mich stärker.