From my own experience and from talking with others, if you take the take home pay per month divided by the gross you made, it likely comes out to between 30%-35%. By take home I mean net of commissions, rebates, desk fees, data feeds, haircuts(a term Bright uses to indicate interest charge for holding overnight), etc. All the firms out there have a different fee structure, but when you do some investigative work and get down to the bottom line, prop firms end up with approximently 70% of your gross. Seems like a raw deal to me. Especially when you consider the long run. Prop firms are like casinos...some traders will make it big and not fall in this 30% range, but overall, they will take 70% of the aggregate of traders' gross profits.