I think it's just consitency. I've only been trading 4.5 years, but when you get to the stage where u r consistent, u just edge up the size periodically. Before you know it the 500 days are now 5000 and on the really good days you might make 40 or 50k. Thing is there is always someone bigger and better than you, just like your question I kinda ask myself how i get to the consistent 20-30k days (given normal market conditions). I guess I gave myself the answer already! anyway main thing is don't push it unless you are doing well, are consistent, and comfortable. Oh and the firm should be irrelevant. Any decent firm seeing a consistent trader will support size increases.