For me it was more living expenses and time commitment rather that actual significant money lost to the market. I first traded at a prop firm w/o guidance at all for 10 months and in that time I made 30K gross but was down due to commissions (mind you, I really had no idean what I was doing). After I got some guidance and started back at square one, I started making consistent money after 6 months and haven't looked back. But in all that time, I was paying rent, groceries, CC bills, college loans etc. Luckily my parents subsidized me while I was learning. Otherwise, I dont know where I would be right now.