Trading on Sports is easier than trading on Stocks, reasoning is basic.
Unless I've got it wrong that is, as far as I'm aware a stock trader dealing his own money can only make money on stocks if the price goes up? Not the case on BF, you can 'sell' the stock before you buy it, theres more opportunities given you can make money with prices going either direction (though you can also make horrendous losses).
Also with markets on BF having off times, the whole machine ticks on at a fair pace, with some focus of an end time for traders who should be able to predict when a price will move in relation to it. The stockmarket has no such facility, could take you years to make your money on an individual trade.
Oh and on BF, you dont pay tax.
Or do you Matt? What is the inland revenues position on all this?