This is notable because in the United States the form of leverage common else where, a contract for difference, is banned. Outside America it is much easier to run these kinds of bucket shops. The key is offering leverage, Kelly's formula suggests that stocks should be traded with a rather narrow band of leverage, under two in most cases. Yet these shops always offer leverage ratios more similar to forex. You would b…
I set up a demo account a while back, and it's pretty impressive the amount of money you can quickly make (and lose) with CFDs. It was possible on a $30,000 capital to make (or lose) over $1000 per day.
I'm a pretty risk averse guy, and also can't be bothered doing enough market research that short term trading is a sensible idea, so I didn't end up investing any real money.