I have to say, there is not a lot much more volatile than betfair. You are unlikely to find stocks that move from say 8p a share, to 12p a share, then to 5p a share, then to 7p. The in-running down to 0.01p a share, then 100p a share. Or the Dow to fall 1000 points in a day for example, where-as loads of horses will at sometime half in price. Obviously you could take large margin positions, but that is not really the same. I almost forgot, I also trade the FTSE on betfair because often it seems like people fall asleep and completely misvalue the market moving up or down, though more recently staying out of this.
Financial market, to me are harder to judge, mainly because more people are doing it. You could give me £1000 & in 2 months I could make it £2000-£3000 on betfair. I couldn't to that on financials