Just like anything worth while those who put their nose to the grindstone and work at it, have the right personality, and a bit of good fortune and luck can do wonderfully well. That;s assuming you call low six figures to the mid/high six figures doing well, as I would call it.
Build a good book for yourself, keep your existing clients happy and you get more and more referrals for new business.
Remember that the active/aggressive traders who frequent this message board are by far a tiny minority in the financial world. The vast majority of wealth is in the hands of more conservative types who rely on the full service they demand from their client/broker relationship.