I touched on it when talking about Record Keeping (6) but you have to realise that every single bets counts. Make sure every single bet is a good one (positive expected value). Those throwaway bets on the live match really add up.
Those interest bets are not so interesting if they are losing. Its one of the reason I keep records. Its amazing when you add up the total of those bets over 10+ years. If you lose just £100 a week that is £50k over those 10 years.
The reality to it is very different as well. If you are betting in 4/5 figures it is very tough to have £50 as an interest bet. You find your bets hit a level that make it more meaningful and interesting.
The only upside is that you get some of it back effectively because of the Premium Charge and those losses can offset other winnings. Its partly where the PC is very clever and really ties you into Betfair.
The two sports I struggle with most for this are Football and NFL. I know plenty about both sports. I know which markets offer the best chance of success but the reality is they are very tough sports to beat. It comes back to discipline.
You are only human for wanting some of these bets but just realise that it will likely cost you money in the long run. They all add up and understanding where your edge is, if you have one, is huge.