NVP, I am not getting what you mean by the difference in stops? The whole idea is to demo stops as you would in a real account.
By the way, I know it is often said that 90% of traders lose. Yes it might be, but how many of these people are good as newbs. They might have read some trading material online for couple of weeks, demoed for a couple more and then took on a real account. Should these people even be considered a statistic? They were bound to fail. Some others give up after a few failed trades.
I think quantifying the number of successful traders its not easy. In my opinion, people who should count toward these stats as failed traders are ones who were very serious about it. Ones who would have been willing to make a career out of it, lived for the markets.