Dave, You can't generalize. My group leader was from worldco, and he made over 1 mil in his 2nd year. I heard he was always in the top 10 list in worldco. He doesn't make as much as he did, but he is consistent, and make several K everyday, with 1 or 2 down days every month.
Well, back in the days it was easy to make that kinda money... with NXs and bullets, plus the fact stocks moved in fractions instead of pennies.
I Traded in SF for less than 6 months. 2 out of 25 guys I met took home checks. So the average was less than 10%. Where is Long, the manager ? He was the MIT guy Worldco brought out to teach the newbie to scalp. He ended up just selling his longs back to the newbies a nickle higher. Man that was the best system around, built in demand.