If you wish to make money purely from trading, then it is worth every penny in subscribing to specialist software such as BetTrader PRO.
They say necessity is the mother of invention and that's definitely the case with these products.
The Betfair interface has been developed to cater for many different types of customer. If you want to specialise in trading and especially scratch trading, then invest in a specialist product. Having live price feeds and one click bet submission at any price, lay or back, gives the trader the absolute flexibility he needs to turn on a sixpence which the Betfair website and most other trading applications don't allow. It's the old adage - you need to spend money to make money. Visit http://solutions.betfair.com for further information on trading applications built by Betfair licensed software vendors.