Quote from oldtime:
the quarterly percentage of the gross came about when these few guys that were consistently profitable figured out they couldn't trade they way they did when their accounts became big the same way they could when they were small.
30% of the profits were a new thing back then that pure stock traders offered.
Not many of them made it. For one thing, no salesman wanted to sell a buy and hold strategy because we got paid on the commissions.
It was all small potatoes back then, clients were just guys who owned businesses like car dealerships and hardware stores.
Doctors were the best because they just didn't want to be bothered with the details.