I ask them how much they are willing to lose? Seriously, any real trader know they pay their dues in money and emotional stress and pain. Most people, it stops them right there, they say nothing. I say then you aren't qualified to be a trader. First you lose, then you break even, then you make money, then you scale up until you make lots of money. It's more detailed than that but you get the point. I am shifitng from break even to making money consistently. This is the toughest mental game I have ever done by far.