It is OK to aim for 20%+ but I wouldn't be to upset if you don't reach that level. Most professional punters that I know of aim for around the 5%-10% as a long term average - certainly anything over 10% would be considered a bonus. To make a living out of punting you need to establish that sort of average POT and then gradually increase turnover (as your bank increases) until you get to your desired income level. The most successful punter I personally know consistantly averages around 7-8% POT and does turnover of in excess of $200000 A MONTH - now that is a nice income!